Cassini Cosmic Dust Analyser (CDA) CDA Standard Products ARCHIVE VOLUME SOFTWARE INTERFACE SPECIFICATION Version 1.0 Jul. 24, 2005 N. Altobelli NASA-JPL 4800 Oak Grove Drive CA-91109 Pasadena, USA S. Kempf MPI for nuclear physics, Saupfercheckweg 1 69117, Heidelberg, Germany M. Sykes Planetary Science Institute, Tucson AZ 85719-2395 IO-AR-012 Cassini Cosmic Dust Analyser (CDA) CDA ARCHIVE VOLUME SOFTWARE INTERFACE SPECIFICATION Version 1.0 Jul 24, 2005 Approved: ____________________________________ _____________ Ralf Srama Date CDA Principal Investigator ____________________________________ _____________ Diane Conner Date Cassini Archive Data Engineer ____________________________________ _____________ Mike A'Hearn Date PDS Small Bodies Node PI 1. INTRODUCTION 1 1.1. Purpose and Scope 1 1.2. Contents 1 1.3. Applicable Documents and Constraints 1 2. DATA PRODUCT CHARACTERISTICS 1 2.1. Instrument Overview 1 2.1.1. Charge Detection Unit 2 2.1.2. Impact Ionization Detector 2 2.1.3. TOF mass spectrometer 2 2.2. Data Products 2 2.2.1. Overview 2 2.2.2. Data Product Detailed Description and Format 4 2.2.3. Data Products Generation 4 2.3. Calibration Issues 4 2.3.1. Calibration of the Impact Ionization Detector 4 2.3.2. Calibration of the Mass Analyser 5 2.4. Data Processing 5 2.4.1. Data Processing Level 5 2.4.2. Data Product Generation 6 3. ARCHIVE VOLUMES 6 3.1. Generation 6 3.2. Data Transfer 7 3.3. Review and Revision 7 3.4. Data Volume Architecture 7 3.5 Interface Media Characteristics 8 3.6 Backup and Duplicates 8 3.7 Labeling and Identification 8 4. SUPPORT STAFF AND COGNIZANT PERSONS 9 Distribution List R. Srama G. Moragas-Klostermeyer E. Gruen M .Burton M. Roy D. Conner Document Change Log Change Date Affected Portions The CDA PDS Data Product contents and formats are evolving as knowledge of instrument performance increases in response to target environments. Final products and their formats will be fixed very late in the mission. ACRONYMS AND ABREVIATIONS ASCII American Standard Code for Information Interchange CAT Chemical Analyser Target CDA Cosmic Dust Analyser CDU Charge Detection Unit DA Dust Analyser HRD High Rate Detector IDD Initial Delivery Date IID Impact Ionization Target JD Julian Day JPL Jet Propulsion Laboratory MPI-K Max Planck Institut fur Kernphysik LSB Least Significant Byte MSB Most Significant Byte NASA National Aeronautics and Space Administration ODL Object Description Language PDS Planetary Data System S/C Spacecraft SBN Small Bodies Node SFDU Standard Formatted Data Unit SIS Software Interface Specification SCLK Spacecraft Clock SOI Saturn Orbit Insertion TBD To Be Determined TOF Time of Flight UTC Universal Time Coordinated 1. INTRODUCTION 1.1. Purpose and Scope This document describes the format and the content of the CDA products as archived in the Small Bodies Node in the PDS. The data products stored in the PDS are a subset of the holdings of the CDA team database in Heidelberg. This SIS is intended to provide enough information to enable users to read and understand the CDA data products as stored in the PDS. The users for whom this SIS is intended are software developers of the programs used in generating the CDA products and scientists who will analyze the data, including those associated with the Cassini-Huygens Project and those in the general planetary science community. 1.2. Contents The Cosmic Dust Analyser (CDA) is an instrument on the Cassini orbiter that studies the physical properties of dust particles hitting the detector. This Data Product SIS describes how the CDA instrument acquires its data, and how the data are processed. This document specifically discusses the high level data subset, which is stored in the PDS. 1.3. Applicable Documents and Constraints This Data Product SIS is responsive to the following Cassini documents: 1 Cassini/Huygens Program Archive Plan for Science Data, PD 699-068. The reader is referred to the following documents for additional information: 1 Planetary Data System Data Preparation Workbook, JPL D-7669, part 1. 2 Planetary Data System Data System Standards Reference, JPL D-7669, part 2. 3 The Cassini Cosmic Dust Analyser, Srama et al., SSR Volume 114, p. 465-518, December 2004. 2. DATA PRODUCT CHARACTERISTICS 2.1. Instrument Overview The Cosmic Dust Analyser instrument (CDA) on the Cassini orbiter is the successor of the dust detectors flown on the Ulysses and the Galileo spacecrafts. The instrument accomplishes the detection of dust impacts by two different means: (1) a high rate detector (HRD), using two separate polyvinylidene fluoride (PVDF) sensors, and (2) a Dust Analyser (DA) based upon impact ionization. The DA measures the electric charges carried by the dust particle, the impact direction, the impact speed, mass, and the chemical composition, whereas the HRD is only capable to determine the mass for particles with a known speed. Note that the data product for the HRD subsystem will not be described here, but in a separate SIS document. The DA detector consists of three components: the charge detection unit, the impact ionization detector itself, and the time-of-flight (TOF) mass spectrometer. 2.1.1. Charge Detection Unit The charge detection unit (CDU) consists of 4 entrance grids mounted in front of the ionization detector. The outermost and innermost grids are grounded, while the two innermost inclined grids are connected with a charge amplifier (QP charge signal). A charged particle flying through the entrance grid system induces its charge onto the innermost grids. The inclined grid mounting leads to asymmetric signal shapes which allows the determination of the particle direction as well as the particle speed within a plane. 2.1.2. Impact Ionization Detector The impact ionization detector consists of a hemispherical impact target (small inner target made of Rhodium Ð chemical analyser target (CAT); large outer target made of Gold Ð impact ionization target (IID)), and the ion collector grid system. The plasma constituents generated by the dust impact onto the impact target are separated by the electric field between the target and the ion grid. The plasma electrons are collected at the CAT (QC charge signal) and the IID (QT charge signal), while most of the positive plasma ions are collected at the ion collector grid system (QI charge signal). Ions escaping the impact ionization detector are inducing their charges onto the charge detection grids (QP charge signal). The particle mass and the impact speed is deduced from the evolution of the impact plasma: the charge yield of the impact plasma is a function of the impactor's mass and velocity, while the plasma charge rise time is dependent on the impact speed only. 2.1.3. TOF mass spectrometer The TOF mass spectrometer consists of the chemical analyser target (CAT), chemical analyser grid located 3 mm in front of the CAT, and the multiplier dynodes connected with the Dynode Logarithmic Amplifier (MP signal). Due to the strong electric field between the grid and the CAT, positive plasma ions are separated very quickly from the plasma and accelerated toward the multiplier, forming a time-of-flight mass spectrum. 2.2. Data Products 2.2.1. Overview All CDA-DA products delivered to the PDS are in tabular format with space-delimited columns. These products are described in Table 2.1. Deliveries will be made to the PDS in accordance with the schedule defined in the Cassini/Huygens Program Archive Plan for Science Data, PD 699-068. Table 2.1. CDA Data Product Overview Product Name Product ID Description Sub-system source Est. Volume (#Files/Total bytes) Comments CDA Area Table CDAAREA The sensitive area of the CDA impact detector (IID) and chemical analyser (CAT) is tabulated as a function of the incident angle with respect to the instrument axis. Calib. 1 / 10 KB CDA Status History CDASTAT Cassini mission and CDA configuration, tests and other events. Records are triggered by change in status affecting the sensitivity of the different CDA instruments and mission events that may affect the interpretation of the data. DA 1 / 300 MB Dust Analyser Event Table CDAEVENTS Spacecraft geometry information for any event which triggered the instrument. In case of a dust impact, detector responses and derived quantities. DA 1 / 10 GB CDA Spectra Table CDASPECTRA Time-of-flight mass spectra peaks for individual impact events. MA 1 / 1 GB [Individual Mass Spectra] MS_XXXXXXXX Time-of-flight mass spectra for individual impacts, identified by their unique identifier number xxxxxxxx. MA > 106 / 10 KB per spectrum xxxxxxxx indicates a unique numeric identifier for each impact event resulting in a mass spectrum CDA QI Signal Table QI_XXXXXXXX Ion signals for individual impacts, identified by their unique identifier number xxxxxxxx. IID 0.3 GB/year xxxxxxxx indicates a unique numeric identifier for each impact event resulting in an ion charge signal CDA QT Signal Table QT_XXXXXXXX Electron signals for individual impacts on the IID target, identified by their unique identifier number xxxxxxxx. IID 0.3 GB/year xxxxxxxx indicates a unique numeric identifier for each impact event resulting in an electron charge signal on the IID target CDA QC Signal Table QC_XXXXXXXX Electron signals for individual impacts on the CAT target, identified by their unique identifier number xxxxxxxx.. CAT 0.15 GB/year xxxxxxxx indicates a unique numeric identifier for each impact event resulting in an electron charge signal on the CAT target CDA QP Signal Table QP_XXXXXXXX Induced charge signal for individual impacts, identified by their unique identifier number xxxxxxxx. CDU 1.2 GB/year xxxxxxxx indicates a unique numeric identifier for each impact event resulting in an induced charge signal on the charge grid device CDA Settings Table CDASETTINGS Table of voltages corresponding to voltage level codes and Coulomb threshold settings. Calib. 1 / 20 KB CDA Counter Table CDACOUNTER CDA impact counter time history file. DA 1 / 1 GB 2.2.2. Data Product Detailed Description and Format See Appendix 1 for provisional PDS labels. See Appendix 2 for condensed column descriptions (derived from the PDS labels). 2.2.3. Data Products Generation All data products and associated documentation will be generated by the CDA team. The PDS SBN will assist in the definition and development of first delivery products and their associated PDS documentation, which will act as templates for subsequent updates. When new products are developed by the CDA team, PDS SBN will likewise assist in the definition and development of those products and their associated PDS documentation in preparation for their initial delivery. 2.3. Calibration Issues 2.3.1. Calibration of the Impact Ionization Detector The calibration principle of the impact ionization detector is similar to the Galileo and Ulysses instrument. The calibration of the velocity-dependence of the signal rise times as well as the calibration of the mass-velocity-dependence of the plasma charge yields is based upon impact experiments in ground based laboratory accelerators. In such facilities, impacts of particles with known mass and velocity onto the flight spare unit can be studied. As the interference of the inner target (CAT) with the outer target (IID) is not entirely understood, future calibration work will be focused on this issue. Besides laboratory experiments, in-flight measurements in the well- understood environment at 1 AU as well as measurements of Jovian stream particles contributed to the instrument calibration. Data obtained after SOI will also contribute to a better understanding of the instrument response. Therefore, a definitive calibration will be available only late in the mission. 2.3.2. Calibration of the Mass Analyser The calibration of the TOF mass spectrometer is still preliminary. In order to determine the mass resolution as well as the instrument characteristics, particles of known composition were shot in the Heidelberg dust accelerator onto the flight spare unit. The same remarks as for the IID subsystem do apply. 2.4. Data Processing 2.4.1. Data Processing Level This documentation uses the "Committee on Data Management and Computation" (CODMAC) data level numbering system. The data files referred to in this document are considered "level 2" or "Edited Data" (equivalent to NASA level 0). The data files are generated from level 1 or "Raw Data" which is the telemetry packets within the project specific Standard Formatted Data Unit (SFDU) record. Refer to Table 1. Table 1. Processing Levels for Science Data Sets NASA CODMAC Description Packet data Raw - Level 1 Telemetry data stream as received at the ground station, with science and engineering data embedded. Level-0 Edited - Level 2 Instrument science data (e.g., raw voltages, counts) at full resolution, time ordered, with duplicates and transmission errors removed. Level 1-A Calibrated - Level 3 Level 0 data that have been located in space and may have been transformed (e.g., calibrated, rearranged) in a reversible manner and packaged with needed ancillary and auxiliary data (e.g., radiances with the calibration equations applied). Level 1-B Resampled - Level 4 Irreversibly transformed (e.g., resampled, remapped, calibrated) values of the instrument measurements (e.g., radiances, magnetic field strength). Level 1-C Derived - Level 5 Level 1A or 1B data that have been resampled and mapped onto uniform space-time grids. The data are calibrated (i.e., radiometrically corrected) and may have additional corrections applied (e.g., terrain correction). Level 2 Derived - Level 5 Geophysical parameters, generally derived from Level 1 data, and located in space and time commensurate with instrument location, pointing, and sampling. Level 3 Derived - Level 5 Geophysical parameters mapped onto uniform space-time grids. 2.4.2. Data Product Generation The CDA data products will be generated by the CDA team at the MPI-K in Heidelberg using the CDA data decoding and calibration software. The CDA event raw data (NASA level 0) will be reconstructed from the telemetry packets (SFDU) delivered by JPL and decoded according to the "CDA FSW users' guide" by the CDA decoding software. The CDA raw data together with meta-data extracted from the telemetry headers and SPICE data products will be deposited in the CDA data base in Heidelberg. Multiple event data will be removed from the stored data set. The higher data products will be exclusively derived from the uncalibrated raw data stored in the Heidelberg data base by means of the CDA calibration software. 3. ARCHIVE VOLUMES 3.1. Generation The CDA Data Product Archive Collection and its updates are produced by the CDA Instrument Team in cooperation with the Small Bodies Node (SBN) of the PDS. It consists of a set of DVDs containing the CDA data set. The DVDs may be generated by SBN when the CDA team generates and transfers to SBN the DVDs images. The Archive Collection will include data acquired during the Cruise phase as well as during the Tour. The SBN and the CDA will collaborate to design the PDS documentation (label, catalog, and index) files associated with the initial data delivery by the CDA team. SBN and the CDA team together will also identify how these files are to be updated in subsequent deliveries. This procedure will also be followed with new data products as they become available. The CDA team will include these documentation files (and subsequent updates) with their deliveries. All data formats are based on the Planetary Data System standards as documented in the PDS Standards Reference. 3.2. Data Transfer The archive volumes are produced and transferred to PDS per schedule agreed upon between the CDA team and SBN and within the schedule defined in the Cassini-Huygens Archive Plan for Science Data. When sufficient data for a new archive volume are ready for validation, according to the mutually agreed upon schedule, the CDA team will deliver the data stored on DVDs to the SBN of the PDS. Delivery may also be electronic, in which case directory file structures of the DVDs will be reflected. 3.3. Review and Revision The archive validation procedure described in this section applies to volumes generated during all phases of the mission. All data archived by the PDS are validated by use of the PDS peer review procedures. The data and documentation will be subject to PDS internal review followed by an external peer review. The external review consists of at least two scientists having interest in the products being generated by the CDA who are associated with neither the CDA team nor the PDS. Reviewers are selected by the PDS with input from the CDA team. In the event that the contents of a volume are found to contain errors, the reviewers can recommend one of two courses of action: fix the files or publish as is with a note in the ERRATA.TXT file. If the errors are minor, typically minor errors in the documentation, the volume can be published if the appropriate notes added to the volume's errata file and the error(s) are corrected on subsequent volumes. If the errors are major, typically involving errors in the data themselves, the corrections constitute liens against the data set that must be resolved before the data set can be ingested by the PDS. In that event, the volume must be corrected, re- generated by the CDA team, and sent back out for review. After peer review and lien resolution, 6 DVD copies of each finalized volume are produced by PDS SBN. Two copies are sent back to the CDA team (Heidelberg and Chicago). Of the remaining four copies, two remain at SBN for online access and backup, one is delivered to PDS CN, and the other is delivered to NSSDC for deep archiving. For accounting purposes, this will be considered a mission cost assumed by the PDS SBN. 3.4. Data Volume Architecture The volume name is COCDA_NNNN, where NNNN is the volume number. Data will be delivered to SBN on DVD or DVD-image with the following directory architecture: COCDA_NNNN ----------AAREADME.TXT , VOLDESC.CAT, ERRATA.TXT | |--/DATA [this directory contains all data products and their labels.] | |--/CATALOG [this directory contains the data set, instrument, | and mission catalog files.] | |--/INDEX [this directory contains the index files for the volume.] | |--/DOCUMENT [this directory contains the document you are reading.] There will be a separate document volume containing appropriate documents on instrument operation and calibration when they are available. The CDA data production rate depends upon the dust impact rate and on the spacecraft telemetry rate. Assuming an average number impact rate of about 2000 events per week (during cruise phase) leads to a predicted data production rate of 8 MB per week . So one DVD-worth of data is produced for every year from the beginning of the Cruise measurements in 1999. The time required to process the data and validate the products is approximately one (1) year. Data volumes are expected to be much higher while in Saturn orbit. 3.5 Interface Media Characteristics All volumes in the CDA PDS Product Archive Collection will be CD-ROMs. If the archive media changes from CD-ROM to DVD, there will be no changes to the file naming or other conventions. 3.6 Backup and Duplicates SBN keeps two copies of each CD-R volume. One volume is placed in the jukebox at SBN in order to make the data web accessible. The second copy is a backup that can be used if the CD- R sent to the vendor becomes lost or damaged. One copy is sent to PDS CN. The two CD-R volumes sent to the CDA Team and the volume sent to NSSDC do not need to be returned to the SBN. 3.7 Labeling and Identification Each CDA PDS CD-ROM bears a volume ID using the last two components of the volume set ID [PDS Standards Reference, 1995]. 4. SUPPORT STAFF AND COGNIZANT PERSONS Table 4.1 Ð CDA PDS Archive Collection Support Staff CDA Team Dr. Sascha Kempf MPI fŸr Kernphysik Saupfercheckweg 1 69117 Heidelberg, Germany +49 6221 516247 Sascha.Kempf@mpi- hd.mpg.de Dr. Ralf Srama MPI fŸr Kernphysik Saupfercheckweg 1 69117 Heidelberg, Germany +49 6221 516423 Ralf.Srama@mpi-hd.mpg.de Dr. Nicolas Altobelli NASA/JPL 4800 Oak Grove Drive CA-91109 Pasadena, USA +1 818 393 0837 Nicolas.altobelli@jpl.nasa.gov Mr. Georg Moragas- Klostermeyer MPI fŸr Kernphysik Saupfercheckweg 1 69117 Heidelberg, Germany +49 6221 516423 Georg.Moragas@mpi- hd.mpg.de Asteroid/Dust Subnode of the SBN, Planetary Science Institute Dr. Carol Neese Planetary Science Institute 1700 East Ft. Lowell, Suite 106 Tucson, AZ 85719-2395 520/622-6300 neese@psi.edu PDS Engineering Node Steven Adams, PDS Cassini Data Engineer Jet Propulsion Laboratory, MS Pasadena, CA +1 818 354 2624 Steven.L.Adams@jpl.nasa.go v APPENDIX 1 Ð PROVISIONAL CDA PRODUCT LABELS The following labels describe the CDA data products to be delivered. New keywords may be added when mutually agreed by the CDA team and PDS Data Engineer for Cassini. Cassini CDA Area Table PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = TBD FILE_RECORDS = TBD ^TABLE = "CDAAREA.TAB" DATA_SET_NAME = "CASSINI CDA DATA V1.0" DATA_SET_ID = "CO-D-CDA-3/4/5-DUST-V1.0" PRODUCT_ID = "CDA-CAL-AREA" PRODUCT_NAME = "CASSINI CDA AREA TABLE" SPACECRAFT_NAME = "CASSINI ORBITER" INSTRUMENT_NAME = "COSMIC DUST ANALYSER" TARGET_NAME = "DUST" START_TIME = "TBD" STOP_TIME = "TBD" PRODUCT_CREATION_TIME = "2005-173T14:20:22" RECORD_FORMAT = "(I2,3(1X,F6.4))" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = TBD COLUMNS = 4 ROW_BYTES = TBD DESCRIPTION = "The sensitive area of the CDA impact detector (IID - total area 0.0825 meter**2) and chemical analyser (CAT - total area 0.0073 meter**2) is tabulated as a function of the incident angle with respect to the instrument axis. Area values are in meter**2, not normalized. They are a numerical simulation of a stream of particles striking the detector at different angles, taking shadowing into account. There are slight variations with azimuthal angle that are not reflected in the table. These are less than 10 percent variations, see SRAMAETAL2004B." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "SENSOR_AXIS_ANGLE" UNIT = "DEGREES" DESCRIPTION = "This is the angle to the sensor axis where zero is along the axis" DATA_TYPE = "ASCII_INTEGER" START_BYTE = 1 BYTES = 2 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "IMPACT_IONIZATION_DETECTOR_AREA" UNIT = "METER**2" DESCRIPTION = "The exposed sensitive area of the outer CDA target (impact ionization detector IID) corresponding to the projected area of the hemispherical detector visible to an incoming particle traveling along a path at the sensor axis angle." DATA_TYPE = "ASCII_REAL" START_BYTE = 4 BYTES = 6 FORMAT = "F6.4" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "CHEMICAL_ANALYSER_AREA" UNIT = "METER**2" DESCRIPTION = "The exposed sensitive area of the inner CDA Rhodium target (chemical analyser target CAT) corresponding to the projected area of the hemispherical detector visible to an incoming particle traveling along a path at the sensor axis angle." DATA_TYPE = "ASCII_REAL" START_BYTE = 11 BYTES = 6 FORMAT = "F6.4" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "TOTAL_AREA" UNIT = "METER**2" DESCRIPTION = "The total exposed sensitive area of the CDA corresponding to the projected area of the hemispherical detector visible to an incoming particle traveling along a path at the sensor axis angle." DATA_TYPE = "ASCII_REAL" START_BYTE = 18 BYTES = 6 FORMAT = "F6.4" END_OBJECT = COLUMN END_OBJECT = TABLE END Cassini CDA Status History PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = TBD FILE_RECORDS = TBD ^TABLE = "CDASTAT.TAB" DATA_SET_NAME = "CASSINI CDA DATA V1.0" DATA_SET_ID = "CO-D-CDA-3/4/5-DUST-V1.0" PRODUCT_ID = "CDA_STAT" PRODUCT_NAME = "CASSINI CDA STATUS HISTORY FILE" SPACECRAFT_NAME = "CASSINI ORBITER" INSTRUMENT_NAME = "COSMIC DUST ANALYSER" TARGET_NAME = "DUST" START_TIME = "TBD" STOP_TIME = "TBD" PRODUCT_CREATION_TIME = "2005-173T14:20:22" RECORD_FORMAT = "(A17,1X,A5,5(1X,I2),3(1X,I3),7(1X,I1),1X,I3)" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = TBD COLUMNS = 18 ROW_BYTES = TBD DESCRIPTION = "CDA configuration state as function of time. Records are triggered by any change in the CDA status, taking into account the sensitivity thresholds of the different CDA subsystems, the compression level of the data, the articulation angle of the turntable, and if the instrument was on or off." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "EVENT_TIME" DESCRIPTION = "The UTC time given in year, day of year, hours, minutes, and seconds in the general form: yyyy-dddThh:mm:ss." DATA_TYPE = "TIME" START_BYTE = 1 BYTES = 17 MISSING_CONSTANT = "9999-999T99:99:99" FORMAT = "A17" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "EVENT_DEFINITION" DESCRIPTION = "A five digit integer which indicates which detectors can trigger a particle detection, coded as follows 1 | QT, 2 | QC, 3 | QA, 4 | QI, 5 | QMA, where the digit value is 0 if the detector is switched off, and 1 if the detector is switched on." DATA_TYPE = "CHARACTER" START_BYTE = 19 BYTES = 5 MISSING_CONSTANT = "99999" FORMAT = "A5" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "QC_THRESHOLD_SETTING" DESCRIPTION = "Code corresponding to the threshold setting at the time of impact for the amplifier connected to the chemical analyser target. Values are between 0 and 15. Conversion to Coulombs is dependent upon rise time and is found in CDASETTINGS.TAB." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 25 BYTES = 2 MISSING_CONSTANT = 99 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "QA_THRESHOLD_SETTING" DESCRIPTION = "Code corresponding to the threshold setting at the time of impact for the amplifier connected to the chemical analyser grid. Values are between 0 and 15. Conversion to Coulombs is dependent upon rise time and is found in CDASETTINGS.TAB." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 28 BYTES = 2 MISSING_CONSTANT = 99 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "QT_THRESHOLD_SETTING" DESCRIPTION = "Code corresponding to the threshold setting at the time of impact for the amplifier connected to the impact ionisation grid. Values are between 0 and 15. Conversion to Coulombs is dependent upon rise time and is found in CDASETTINGS.TAB." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 31 BYTES = 2 MISSING_CONSTANT = 99 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "QI_THRESHOLD_SETTING" DESCRIPTION = "Code corresponding to the threshold setting at the time of impact for the amplifier connected to the ion grid. Values are between 0 and 15. Conversion to Coulombs is dependent upon rise time and is found in CDASETTINGS.TAB." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 34 BYTES = 2 MISSING_CONSTANT = 99 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "QMA_THRESHOLD_SETTING" DESCRIPTION = "Code corresponding to the threshold setting at the time of impact for the amplifier connected to the multiplier anode. Values are between 0 and 15. Conversion to Coulombs is dependent upon rise time and is found in CDASETTINGS.TAB." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 37 BYTES = 2 MISSING_CONSTANT = 99 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "MULTIPLIER_VOLTAGE_LEVEL" DESCRIPTION = "The multiplier high voltage level setting, in steps between 0 and 255. Corresponding voltages are found in CDASETTINGS.TAB." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 40 BYTES = 3 MISSING_CONSTANT = 999 FORMAT = "I3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "ION_GRID_VOLTAGE_LEVEL" DESCRIPTION = "The ion grid high voltage level setting, in steps between 0 and 255. Corresponding voltages are found in CDASETTINGS.TAB." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 44 BYTES = 3 MISSING_CONSTANT = 999 FORMAT = "I3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "CHEMICAL_ANALYSER_VOLTAGE_LEVEL" DESCRIPTION = "The chemical analyser high voltage level setting, in steps between 0 and 255. Corresponding voltages are found in CDASETTINGS.TAB." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 48 BYTES = 3 MISSING_CONSTANT = 999 FORMAT = "I3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "CDA_LISTEN_FLAG" DESCRIPTION = "A flag indicating that CDA was in a measurement mode (1) or not (0)." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 52 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "CDA_HARD_STATUS" DESCRIPTION = "Code indicating whether CDA was on (1) or off (0)." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 54 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 NAME = "QI_SHRINKING" DESCRIPTION = "A description of the degree of lossy data compression applied to the transmitted time-resolved ion grid signal (QI), where there is no compression (1) or compression by factors of 2 (2) or 4 (4). The compression degree strongly affects the accuracy of the data reduction on Earth." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 56 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 NAME = "QC_SHRINKING" DESCRIPTION = "A description of the degree of lossy data compression applied to the transmitted the time-resolved electron charge signal at the chemical target (QC), where there is no compression (1) or compression by factors of 2 (2) or 4 (4). The compression degree strongly affects the accuracy of the data reduction on Earth." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 58 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 15 NAME = "QT_SHRINKING" DESCRIPTION = "A description of the degree of lossy data compression applied to the transmitted the time-resolved electron charge signal at the impact target (QT), where there is no compression (1) or compression by factors of 2 (2) or 4 (4). The compression degree strongly affects the accuracy of the data reduction on Earth." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 60 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 16 NAME = "QP_SHRINKING" DESCRIPTION = "A description of the degree of lossy data compression applied to the transmitted the time-resolved ion grid signal (QP), where there is no compression (1) or compression by factors of 2 (2) or 4 (4). The compression degree strongly affects the accuracy of the data reduction on Earth." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 62 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 17 NAME = "MP_SHRINKING" DESCRIPTION = "A description of the degree of lossy data compression applied to the transmitted the time-resolved ion grid signal (MP), where there is no compression (1) or compression by factors of 2 (2) or 4 (4). The compression degree strongly affects the accuracy of the data reduction on Earth." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 64 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 18 NAME = "ARTICULATION_POSITION" DESCRIPTION = "CDA articulation position on the turntable given in degrees. The CDA instrument boresight within the S/C coordinate systems depends upon the position a as: x = 1/8 ( -1 - SQRT(3) + (-1 + SQRT(3)) COS(a) - 2 SQRT(6) SIN(a) ) y = 1/8 ( 3 + SQRT(3) + (-3 + SQRT(3)) COS(a) - 2 SQRT(2) SIN(a) ) z = 1/4 ( -1 + SQRT(3) + ( 1 + SQRT(3)) COS(a) )" DATA_TYPE = "ASCII_INTEGER" START_BYTE = 66 BYTES = 3 MISSING_CONSTANT = 999 FORMAT = "I3" END_OBJECT = COLUMN END_OBJECT = TABLE END Cassini CDA Dust Analyser Events Table PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = TBD FILE_RECORDS = TBD ^TABLE = "CDAEVENTS.TAB" DATA_SET_NAME = "CASSINI CDA DATA V1.0" DATA_SET_ID = "CO-D-CDA-3/4/5-DUST-V1.0" PRODUCT_ID = "CDA_DA_IMPACTS" PRODUCT_NAME = "CASSINI CDA DUST ANALYSER EVENTS TABLE" SPACECRAFT_NAME = "CASSINI ORBITER" INSTRUMENT_NAME = "COSMIC DUST ANALYSER" TARGET_NAME = "DUST" START_TIME = "1999-084T00:00:00" STOP_TIME = "2000-100T00:00:00" PRODUCT_CREATION_TIME = "2005-202T18:44:32" RECORD_FORMAT = "(I10,1X,A17,1X,F14.6,1X,E8.1,1X,I1,1X,E8.1,1X,I1,1X,E8.1,1X,I1,1X,E8.1, 1X,I1,3(1X,E8.1),1X,I1,2(1X,F7.2),1X,F6.4,2(1X,F7.2), 1X,F8.2,3(1X,F6.2),2(1X,F7.2),1X,I2,1X,I3,1X,F5.1,1X,F4.1,1X,E8.1, 1X,F4.1,2(1X,E8.1),1X,I1)" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = TBD COLUMNS = 35 ROW_BYTES = TBD DESCRIPTION = "Detector responses and derived quantities from the Cassini dust detector as well as spacecraft geometry information for each event wich triggered the instrument. An event class flag is provided to distinguish between 4 differents types of signals: test pulses, noise, weak and strong impacts. However, this flag value may be poorly reliable. Only a carefully analysis of the individual charge signals combined with the CDA documentation (see SRAMAETAL2004B) can confirm the event class. For each event, and for each of the QP, QT, QI, QC channels, a flag is set to 1 if a charge signal was transmitted to Earth. The charge signal can then be found in the appropriate directory." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "EVENT_ID" DESCRIPTION = "An identifier number associated with an event." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 1 BYTES = 10 MISSING_CONSTANT = -999999999 FORMAT = "I10" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "EVENT_TIME" DESCRIPTION = "The UTC time of an event given in year, day of year, hours, minutes, and seconds in the general form:yyyy-dddThh:mm:ss. Uncertainty is smaller than 1 second." DATA_TYPE = "TIME" START_BYTE = 12 BYTES = 17 MISSING_CONSTANT = "9999-999T99:99:99" FORMAT = "A17" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "EVENT_JULIAN_DATE" UNIT = "DAY" DESCRIPTION = "The full Julian date of an event. Uncertainty is smaller than 1 second." DATA_TYPE = "ASCII_REAL" START_BYTE = 30 BYTES = 14 MISSING_CONSTANT = -999999.999999 FORMAT = "F14.6" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "QP_AMPLITUDE" UNIT = "COULOMBS" DESCRIPTION = "Amplitude of the entrance grid channel signal. In case of a dust impact event, particle charge as measured by the signal maximum." DATA_TYPE = "ASCII_REAL" START_BYTE = 45 BYTES = 8 MISSING_CONSTANT = -9.9E-99 FORMAT = "E8.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "QP_SIGNAL_FLAG" DESCRIPTION = "This flag is set to 1 if a charge signal is provided for this event in the QP_SIGNAL directory." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 54 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "QI_AMPLITUDE" UNIT = "COULOMBS" DESCRIPTION = "Amplitude of the signal monitored by the integrating amplifier connected to the ion grid. In case of a dust impact event, fraction of the plasma ion charge yield generated by the impact." DATA_TYPE = "ASCII_REAL" START_BYTE = 56 BYTES = 8 MISSING_CONSTANT = -9.9E-99 FORMAT = "E8.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "QI_SIGNAL_FLAG" DESCRIPTION = "This flag is set to 1 if a charge signal is provided for this event in the QI_SIGNAL directory." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 65 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "QT_AMPLITUDE" UNIT = "COULOMBS" DESCRIPTION = "Amplitude of the signal monitored by the integrating amplifier connected to the impact ionization target (IID). In case of a dust impact event, fraction of the plasma electron charge yield generated by the particle impact." DATA_TYPE = "ASCII_REAL" START_BYTE = 67 BYTES = 8 MISSING_CONSTANT = -9.9E-99 FORMAT = "E8.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "QT_SIGNAL_FLAG" DESCRIPTION = "This flag is set to 1 if a charge signal is provided for this event in the QT_SIGNAL directory." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 76 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "QC_AMPLITUDE" UNIT = "COULOMBS" DESCRIPTION = "Amplitude of the signal monitored by the integrating amplifier connected to the chemical analyser target (CAT). In case of a dust impact event, fraction of the plasma electron charge yield generated by the particle impact." DATA_TYPE = "ASCII_REAL" START_BYTE = 78 BYTES = 8 MISSING_CONSTANT = -9.9E-99 FORMAT = "E8.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "QCSIGNAL_FLAG" DESCRIPTION = "This flag is set to 1 if a charge signal is provided for this event in the QC_SIGNAL directory." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 87 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "QI_RISE_TIME" UNIT = "SECONDS" DESCRIPTION = "The signal from the ion grid is reconstructed and converted to Coulomb. The rise time is that time elapsed between 10% and 90% of the signal maximum. The error on the rise time is set by the channel sampling rate and is of 166.6E-9 s. In case of a noise event, or if the signal amplitude is zero, the rise time is set to its missing value." DATA_TYPE = "ASCII_REAL" START_BYTE = 89 BYTES = 8 MISSING_CONSTANT = -9.9E-99 FORMAT = "E8.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 NAME = "QT_RISE_TIME" UNIT = "SECONDS" DESCRIPTION = "The signal from the impact ionization detector is reconstructed and converted to Coulomb. The rise time is that time elapsed between 10% and 90% of the signal maximum. The error on the rise time is set by the channel sampling rateand is of 333.3E-9 s. In case of a noise event, or if the signal amplitude is zero, the rise time is set to its missing value." DATA_TYPE = "ASCII_REAL" START_BYTE = 98 BYTES = 8 MISSING_CONSTANT = -9.9E-99 FORMAT = "E8.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 NAME = "QC_RISE_TIME" UNIT = "SECONDS" DESCRIPTION = "The signal from the chemical analyser target is reconstructed and converted to Coulomb. The rise time is that time elapsed between 10% and 90% of the signal maximum. The error on the rise time is set by the channel sampling rate and is of 166.6E-9 s. In case of a noise event, or if the signal amplitude is zero, the rise time is set to its missing value." DATA_TYPE = "ASCII_REAL" START_BYTE = 107 BYTES = 8 MISSING_CONSTANT = -9.9E-99 FORMAT = "E8.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 15 NAME = "TARGET_FLAG" DESCRIPTION = "In case of an impact event, the target flag (TF) indicates that portion of the target impacted. TF|Portion: 0|Unknown, 1|Chemical Analyser Target, (inner target), 2|Impact Ionization Detector, (outer target), 3|QP-Grid, 4|CAT-Grid, 5|Wall impacts. Will be supplied in later delivery, when a reliable determination method will be available." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 116 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 16 NAME = "SPACECRAFT_RIGHT_ASCENSION" UNIT = "DEGREES" DESCRIPTION = "The heliocentric right ascension (J2000) of the spacecraft." DATA_TYPE = "ASCII_REAL" START_BYTE = 118 BYTES = 7 MISSING_CONSTANT = -999.99 FORMAT = "F7.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 17 NAME = "SPACECRAFT_DECLINATION" UNIT = "DEGREES" DESCRIPTION = "The heliocentric declination (J2000) of the spacecraft." DATA_TYPE = "ASCII_REAL" START_BYTE = 126 BYTES = 7 MISSING_CONSTANT = -999.99 FORMAT = "F7.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 18 NAME = "SPACECRAFT_SUN_DISTANCE" UNIT = "AU" DESCRIPTION = "The distance from the spacecraft to the Sun." DATA_TYPE = "ASCII_REAL" START_BYTE = 134 BYTES = 6 MISSING_CONSTANT = 9.9999 FORMAT = "F6.4" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 19 NAME = "SPACECRAFT_SATURN_SYSTEM_III_LONGITUDE" UNIT = "DEGREES" DESCRIPTION = "The sub-Saturn longitude of the spacecraft in the System III coordinates: +z is the pole axis of Saturn, xy the ring plane. +x is the projection of the J2000 vernal equinox direction onto the ring plane" DATA_TYPE = "ASCII_REAL" START_BYTE = 141 BYTES = 7 MISSING_CONSTANT = -999.99 FORMAT = "F7.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 20 NAME = "SPACECRAFT_SATURN_SYSTEM_III_LATITUDE" UNIT = "DEGREES" DESCRIPTION = "The sub-Saturn latitude of the spacecraft in the System III coordinates: +z is the pole axis of Saturn, xy the ring plane. +x is the projection of the J2000 vernal equinox direction onto the ring plane" DATA_TYPE = "ASCII_REAL" START_BYTE = 149 BYTES = 7 MISSING_CONSTANT = -999.99 FORMAT = "F7.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 21 NAME = "SPACECRAFT_SATURN_DISTANCE" UNIT = "SAT_RA" DESCRIPTION = "The distance from the spacecraft to Saturn in Saturnian radii." DATA_TYPE = "ASCII_REAL" START_BYTE = 157 BYTES = 8 MISSING_CONSTANT = -9999.99 FORMAT = "F8.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 22 NAME = "SPACECRAFT_X_VELOCITY" UNIT = "KM/S" DESCRIPTION = "The J2000 heliocentric equatorial X component of the Cassini velocity vector." DATA_TYPE = "ASCII_REAL" START_BYTE = 166 BYTES = 6 MISSING_CONSTANT = -99.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 23 NAME = "SPACECRAFT_Y_VELOCITY" UNIT = "KM/S" DESCRIPTION = "The J2000 heliocentric equatorial Y component of the Cassini velocity vector." DATA_TYPE = "ASCII_REAL" START_BYTE = 173 BYTES = 6 MISSING_CONSTANT = -99.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 24 NAME = "SPACECRAFT_Z_VELOCITY" UNIT = "KM/S" DESCRIPTION = "The J2000 heliocentric equatorial Z component of the Cassini velocity vector." DATA_TYPE = "ASCII_REAL" START_BYTE = 180 BYTES = 6 MISSING_CONSTANT = -99.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 25 NAME = "DETECTOR_RIGHT_ASCENSION" UNIT = "DEGREES" DESCRIPTION = "The spacecraft-centered right ascension (J2000) of the sensor axis." DATA_TYPE = "ASCII_REAL" START_BYTE = 187 BYTES = 7 MISSING_CONSTANT = -999.99 FORMAT = "F7.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 26 NAME = "DETECTOR_DECLINATION" UNIT = "DEGREES" DESCRIPTION = "The spacecraft-centered declination (J2000) of the sensor axis." DATA_TYPE = "ASCII_REAL" START_BYTE = 195 BYTES = 7 MISSING_CONSTANT = -999.99 FORMAT = "F7.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 27 NAME = "COUNTER_NUMBER" DESCRIPTION = "Event counter assigned by the on-board event evaluation algorithm with a value between 0 and 19. The event counter value is a rough measure for the properties of the registered event." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 203 BYTES = 2 MISSING_CONSTANT = -9 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 28 NAME = "EVENT_QUALITY" DESCRIPTION = "Event quality assigned by the on-board evaluation algorithm. The event class takes values between 0 and 4 and is a rough measure for the quality of the event 0 - noise 1 - test pulse, 2 - small impact, 3 - strong impact, 4 - impacts with TOF mass spectrum). Will be supplied in later delivery, when a reliable determination method will be available." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 206 BYTES = 3 MISSING_CONSTANT = -9 FORMAT = "I3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 29 NAME = "PARTICLE_SPEED" UNIT = "KILOMETER PER SECOND" DESCRIPTION = "The impact speed of the particle relative to the spacecraft. When no speed can be determined, or in case of a noise event, the value is set to its missing value. Will be supplied in later delivery, when a reliable determination method will be available." DATA_TYPE = "ASCII_REAL" START_BYTE = 210 BYTES = 5 MISSING_CONSTANT = -99.9 FORMAT = "F5.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 30 NAME = "PARTICLE_SPEED_FACTOR" DESCRIPTION = "An upper and lower estimate of impactor speed relative to the spacecraft is obtained by multiplying and dividing, respectively, the particle speed by this factor. When no speed (hence error factor) can be determined, the value of this factor is set to its missing value. Will be supplied in later delivery, when a reliable determination method will be available." DATA_TYPE = "ASCII_REAL" START_BYTE = 216 BYTES = 4 MISSING_CONSTANT = -9.9 FORMAT = "F4.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 31 NAME = "PARTICLE_MASS" UNIT = "KG" DESCRIPTION = "The particle mass. When the particle speed is not determined, the mass is not determined and is set to its missing value. Will be supplied in later delivery, when a reliable determination method will be available." DATA_TYPE = "ASCII_REAL" START_BYTE = 221 BYTES = 8 MISSING_CONSTANT = -9.9E-99 FORMAT = "E8.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 32 NAME = "PARTICLE_MASS_FACTOR" DESCRIPTION = "An upper and lower estimate of the impactor mass is obtained by multiplying and dividing, respectively, the particle mass by this factor. When the speed is not determined, neither is the mass, and this factor is set to its missing value. Will be supplied in later delivery, when a reliable determination method will be available." DATA_TYPE = "ASCII_REAL" START_BYTE = 230 BYTES = 4 MISSING_CONSTANT = -9.9 FORMAT = "F4.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 33 NAME = "PARTICLE_CHARGE" UNIT = "COULOMB" DESCRIPTION = "The charge of a particle derived from the entrance grid signal. When no charge can be determined, the value is set to its missing value. Will be supplied in later delivery, when a reliable determination method will be available." DATA_TYPE = "ASCII_REAL" START_BYTE = 235 BYTES = 8 MISSING_CONSTANT = -9.9E-99 FORMAT = "E8.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 34 NAME = "PARTICLE_CHARGE_ERROR" DESCRIPTION = "The error factor associated with the particle charge. An upper and lower particle charge by this factor. Will be supplied in later delivery, when a reliable determination method will be available." DATA_TYPE = "ASCII_REAL" START_BYTE = 244 BYTES = 8 MISSING_CONSTANT = -9.9E-99 FORMAT = "E8.1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 35 NAME = "SPECTRUM_FLAG" DESCRIPTION = "A flag indicating if there exists a corresponding mass spectrum for the particle (1) or not (0)." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 253 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN END_OBJECT = TABLE END Cassini CDA Spectra Peaks Table PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = TBD FILE_RECORDS = TBD ^TABLE = "CDASPECTRA.TAB" DATA_SET_NAME = "CASSINI CDA DATA V1.0" DATA_SET_ID = "CO-D-CDA-3/4/5-DUST-V1.0" PRODUCT_ID = "CDA-SPECTRA" PRODUCT_NAME = "CASSINI CDA SPECTRA PEAKS TABLE" SPACECRAFT_NAME = "CASSINI ORBITER" INSTRUMENT_NAME = "COSMIC DUST ANALYSER" TARGET_NAME = "DUST" START_TIME = "TBD" STOP_TIME = "TBD" PRODUCT_CREATION_TIME = "2005-173T14:20:22" RECORD_FORMAT = "(I10,2(1X,I2),6(1X,E10.3),1X,F6.2,4(1X,E10.3),1X,F6.2,4(1X,E10.3), 1X,F6.2,4(1X,E10.3),1X,F6.2,4(1X,E10.3),1X,F6.2,4(1X,E10.3), 1X,F6.2,4(1X,E10.3),1X,F6.2,4(1X,E10.3),1X,F6.2,4(1X,E10.3), 1X,F6.2,4(1X,E10.3),1X,F6.2,4(1X,E10.3),1X,F6.2)" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = TBD COLUMNS = 60 ROW_BYTES = TBD DESCRIPTION = "Time-of-flight mass spectra evaluation of individual impact events. The Cassini CDA Mass Analyser has a capability of reliably distinguishing eleven or fewer peaks in the mass spectrum. Peaks are given in time order." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "IMPACT_EVENT_ID" DESCRIPTION = "An identifier number associated with a dust impact with a TOF mass spectrum." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 1 BYTES = 10 MISSING_CONSTANT = -999999999 FORMAT = "I10" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "NUMBER_PEAKS" DESCRIPTION = "The number of distinguishable peaks in the mass spectrum of an impacting particle." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 12 BYTES = 2 MISSING_CONSTANT = -9 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "SCALE_ID" DESCRIPTION = "Identifier flag showing how the mass scale was calculated. 0: from impact time only, 1: from impact time and first peak, 2: from two reference peaks." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 15 BYTES = 2 MISSING_CONSTANT = -9 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "SCALE_POS1" UNIT = "SECOND" DESCRIPTION = "Reference position (time) of first peak for mass scale calculation, in second from trigger time." DATA_TYPE = "ASCII_REAL" START_BYTE = 18 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "SCALE_POS2" UNIT = "SECOND" DESCRIPTION = "Reference position (time) of second peak for mass scale calculation, in second from trigger time." DATA_TYPE = "ASCII_REAL" START_BYTE = 29 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "PEAK_1_FLIGHT_TIME" UNIT = "SECONDS" DESCRIPTION = "Time elapsed between Mass Analyser triggering and first spectral peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 40 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "PEAK_1_FLIGHT_TIME_UNCERTAINTY" UNIT = "SECONDS" DESCRIPTION = "The uncertainty in the time elapsed between Mass Analyser triggering and first spectral peak" DATA_TYPE = "ASCII_REAL" START_BYTE = 51 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "PEAK_1_AMPLITUDE" UNIT = "VOLT" DESCRIPTION = "This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data" DATA_TYPE = "ASCII_REAL" START_BYTE = 62 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "PEAK_1_INTEGRAL" UNIT = "VOLT SECOND" DESCRIPTION = "The peak integral is the area below the amplitude curve. The integral is calculated on the processed data (x=time scale, y=volt-scale)" DATA_TYPE = "ASCII_REAL" START_BYTE = 73 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "PEAK_1_MASS" UNIT = "AMU" DESCRIPTION = "Atomic weight corresponding to 1st mass peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 84 BYTES = 6 MISSING_CONSTANT = -9.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "PEAK_2_FLIGHT_TIME" UNIT = "SECONDS" DESCRIPTION = "Time elapsed between Mass Analyser triggering and 2th spectral peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 91 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "PEAK_2_FLIGHT_TIME_UNCERTAINTY" UNIT = "SECONDS" DESCRIPTION = "The uncertainty in the time elapsed between Mass Analyser triggering and 2th spectral peak" DATA_TYPE = "ASCII_REAL" START_BYTE = 102 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 NAME = "PEAK_2_AMPLITUDE" UNIT = "VOLT" DESCRIPTION = "This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data" DATA_TYPE = "ASCII_REAL" START_BYTE = 113 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 NAME = "PEAK_2_INTEGRAL" UNIT = "VOLT SECOND" DESCRIPTION = "The peak integral is the area below the amplitude curve. The integral is calculated on the processed data (x=time scale, y=volt-scale)" DATA_TYPE = "ASCII_REAL" START_BYTE = 124 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 15 NAME = "PEAK_2_MASS" UNIT = "AMU" DESCRIPTION = "Atomic weight corresponding to 2th mass peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 135 BYTES = 6 MISSING_CONSTANT = -9.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 16 NAME = "PEAK_3_FLIGHT_TIME" UNIT = "SECONDS" DESCRIPTION = "Time elapsed between Mass Analyser triggering and 3th spectral peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 142 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 17 NAME = "PEAK_3_FLIGHT_TIME_UNCERTAINTY" UNIT = "SECONDS" DESCRIPTION = "The uncertainty in the time elapsed between Mass Analyser triggering and 3th spectral peak" DATA_TYPE = "ASCII_REAL" START_BYTE = 153 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 18 NAME = "PEAK_3_AMPLITUDE" UNIT = "VOLT" DESCRIPTION = "This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data" DATA_TYPE = "ASCII_REAL" START_BYTE = 164 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 19 NAME = "PEAK_3_INTEGRAL" UNIT = "VOLT SECOND" DESCRIPTION = "The peak integral is the area below the amplitude curve. The integral is calculated on the processed data (x=time scale, y=volt-scale)" DATA_TYPE = "ASCII_REAL" START_BYTE = 175 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 20 NAME = "PEAK_3_MASS" UNIT = "AMU" DESCRIPTION = "Atomic weight corresponding to 3th mass peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 186 BYTES = 6 MISSING_CONSTANT = -9.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 21 NAME = "PEAK_4_FLIGHT_TIME" UNIT = "SECONDS" DESCRIPTION = "Time elapsed between Mass Analyser triggering and 4th spectral peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 193 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 22 NAME = "PEAK_4_FLIGHT_TIME_UNCERTAINTY" UNIT = "SECONDS" DESCRIPTION = "The uncertainty in the time elapsed between Mass Analyser triggering and 4th spectral peak" DATA_TYPE = "ASCII_REAL" START_BYTE = 204 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 23 NAME = "PEAK_4_AMPLITUDE" UNIT = "VOLT" DESCRIPTION = "This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data" DATA_TYPE = "ASCII_REAL" START_BYTE = 215 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 24 NAME = "PEAK_4_INTEGRAL" UNIT = "VOLT SECOND" DESCRIPTION = "The peak integral is the area below the amplitude curve. The integral is calculated on the processed data (x=time scale, y=volt-scale)" DATA_TYPE = "ASCII_REAL" START_BYTE = 226 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 25 NAME = "PEAK_4_MASS" UNIT = "AMU" DESCRIPTION = "Atomic weight corresponding to 4th mass peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 237 BYTES = 6 MISSING_CONSTANT = -9.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 26 NAME = "PEAK_5_FLIGHT_TIME" UNIT = "SECONDS" DESCRIPTION = "Time elapsed between Mass Analyser triggering and 5th spectral peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 244 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 27 NAME = "PEAK_5_FLIGHT_TIME_UNCERTAINTY" UNIT = "SECONDS" DESCRIPTION = "The uncertainty in the time elapsed between Mass Analyser triggering and 5th spectral peak" DATA_TYPE = "ASCII_REAL" START_BYTE = 255 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 28 NAME = "PEAK_5_AMPLITUDE" UNIT = "VOLT" DESCRIPTION = "This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data" DATA_TYPE = "ASCII_REAL" START_BYTE = 266 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 29 NAME = "PEAK_5_INTEGRAL" UNIT = "VOLT SECOND" DESCRIPTION = "The peak integral is the area below the amplitude curve. The integral is calculated on the processed data (x=time scale, y=volt-scale)" DATA_TYPE = "ASCII_REAL" START_BYTE = 277 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 30 NAME = "PEAK_5_MASS" UNIT = "AMU" DESCRIPTION = "Atomic weight corresponding to 5th mass peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 288 BYTES = 6 MISSING_CONSTANT = -9.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 31 NAME = "PEAK_6_FLIGHT_TIME" UNIT = "SECONDS" DESCRIPTION = "Time elapsed between Mass Analyser triggering and 6th spectral peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 295 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 32 NAME = "PEAK_6_FLIGHT_TIME_UNCERTAINTY" UNIT = "SECONDS" DESCRIPTION = "The uncertainty in the time elapsed between Mass Analyser triggering and 6th spectral peak" DATA_TYPE = "ASCII_REAL" START_BYTE = 306 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 33 NAME = "PEAK_6_AMPLITUDE" UNIT = "VOLT" DESCRIPTION = "This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data" DATA_TYPE = "ASCII_REAL" START_BYTE = 317 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 34 NAME = "PEAK_6_INTEGRAL" UNIT = "VOLT SECOND" DESCRIPTION = "The peak integral is the area below the amplitude curve. The integral is calculated on the processed data (x=time scale, y=volt-scale)" DATA_TYPE = "ASCII_REAL" START_BYTE = 328 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 35 NAME = "PEAK_6_MASS" UNIT = "AMU" DESCRIPTION = "Atomic weight corresponding to 6th mass peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 339 BYTES = 6 MISSING_CONSTANT = -9.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 36 NAME = "PEAK_7_FLIGHT_TIME" UNIT = "SECONDS" DESCRIPTION = "Time elapsed between Mass Analyser triggering and 7th spectral peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 346 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 37 NAME = "PEAK_7_FLIGHT_TIME_UNCERTAINTY" UNIT = "SECONDS" DESCRIPTION = "The uncertainty in the time elapsed between Mass Analyser triggering and 7th spectral peak" DATA_TYPE = "ASCII_REAL" START_BYTE = 357 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 38 NAME = "PEAK_7_AMPLITUDE" UNIT = "VOLT" DESCRIPTION = "This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data" DATA_TYPE = "ASCII_REAL" START_BYTE = 368 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 39 NAME = "PEAK_7_INTEGRAL" UNIT = "VOLT SECOND" DESCRIPTION = "The peak integral is the area below the amplitude curve. The integral is calculated on the processed data (x=time scale, y=volt-scale)" DATA_TYPE = "ASCII_REAL" START_BYTE = 379 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 40 NAME = "PEAK_7_MASS" UNIT = "AMU" DESCRIPTION = "Atomic weight corresponding to 7th mass peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 390 BYTES = 6 MISSING_CONSTANT = -9.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 41 NAME = "PEAK_8_FLIGHT_TIME" UNIT = "SECONDS" DESCRIPTION = "Time elapsed between Mass Analyser triggering and 8th spectral peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 397 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 42 NAME = "PEAK_8_FLIGHT_TIME_UNCERTAINTY" UNIT = "SECONDS" DESCRIPTION = "The uncertainty in the time elapsed between Mass Analyser triggering and 8th spectral peak" DATA_TYPE = "ASCII_REAL" START_BYTE = 408 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 43 NAME = "PEAK_8_AMPLITUDE" UNIT = "VOLT" DESCRIPTION = "This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data" DATA_TYPE = "ASCII_REAL" START_BYTE = 419 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 44 NAME = "PEAK_8_INTEGRAL" UNIT = "VOLT SECOND" DESCRIPTION = "The peak integral is the area below the amplitude curve. The integral is calculated on the processed data (x=time scale, y=volt-scale)" DATA_TYPE = "ASCII_REAL" START_BYTE = 430 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 45 NAME = "PEAK_8_MASS" UNIT = "AMU" DESCRIPTION = "Atomic weight corresponding to 8th mass peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 441 BYTES = 6 MISSING_CONSTANT = -9.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 46 NAME = "PEAK_9_FLIGHT_TIME" UNIT = "SECONDS" DESCRIPTION = "Time elapsed between Mass Analyser triggering and 9th spectral peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 448 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 47 NAME = "PEAK_9_FLIGHT_TIME_UNCERTAINTY" UNIT = "SECONDS" DESCRIPTION = "The uncertainty in the time elapsed between Mass Analyser triggering and 9th spectral peak" DATA_TYPE = "ASCII_REAL" START_BYTE = 459 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 48 NAME = "PEAK_9_AMPLITUDE" UNIT = "VOLT" DESCRIPTION = "This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data" DATA_TYPE = "ASCII_REAL" START_BYTE = 470 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 49 NAME = "PEAK_9_INTEGRAL" UNIT = "VOLT SECOND" DESCRIPTION = "The peak integral is the area below the amplitude curve. The integral is calculated on the processed data (x=time scale, y=volt-scale)" DATA_TYPE = "ASCII_REAL" START_BYTE = 481 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 50 NAME = "PEAK_9_MASS" UNIT = "AMU" DESCRIPTION = "Atomic weight corresponding to 9th mass peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 492 BYTES = 6 MISSING_CONSTANT = -9.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 51 NAME = "PEAK_10_FLIGHT_TIME" UNIT = "SECONDS" DESCRIPTION = "Time elapsed between Mass Analyser triggering and 10th spectral peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 499 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 52 NAME = "PEAK_10_FLIGHT_TIME_UNCERTAINTY" UNIT = "SECONDS" DESCRIPTION = "The uncertainty in the time elapsed between Mass Analyser triggering and 10th spectral peak" DATA_TYPE = "ASCII_REAL" START_BYTE = 510 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 53 NAME = "PEAK_10_AMPLITUDE" UNIT = "VOLT" DESCRIPTION = "This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data" DATA_TYPE = "ASCII_REAL" START_BYTE = 521 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 54 NAME = "PEAK_10_INTEGRAL" UNIT = "VOLT SECOND" DESCRIPTION = "The peak integral is the area below the amplitude curve. The integral is calculated on the processed data (x=time scale, y=volt-scale)" DATA_TYPE = "ASCII_REAL" START_BYTE = 532 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 55 NAME = "PEAK_10_MASS" UNIT = "AMU" DESCRIPTION = "Atomic weight corresponding to 10th mass peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 543 BYTES = 6 MISSING_CONSTANT = -9.99 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 56 NAME = "PEAK_11_FLIGHT_TIME" UNIT = "SECONDS" DESCRIPTION = "Time elapsed between Mass Analyser triggering and 11th spectral peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 550 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 57 NAME = "PEAK_11_FLIGHT_TIME_UNCERTAINTY" UNIT = "SECONDS" DESCRIPTION = "The uncertainty in the time elapsed between Mass Analyser triggering and 11th spectral peak" DATA_TYPE = "ASCII_REAL" START_BYTE = 561 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 58 NAME = "PEAK_11_AMPLITUDE" UNIT = "VOLT" DESCRIPTION = "This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data" DATA_TYPE = "ASCII_REAL" START_BYTE = 572 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 59 NAME = "PEAK_11_INTEGRAL" UNIT = "VOLT SECOND" DESCRIPTION = "The peak integral is the area below the amplitude curve. The integral is calculated on the processed data (x=time scale, y=volt-scale)" DATA_TYPE = "ASCII_REAL" START_BYTE = 583 BYTES = 10 MISSING_CONSTANT = -9.999E-99 FORMAT = "E10.3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 60 NAME = "PEAK_11_MASS" UNIT = "AMU" DESCRIPTION = "Atomic weight corresponding to 11th mass peak." DATA_TYPE = "ASCII_REAL" START_BYTE = 594 BYTES = 6 MISSING_CONSTANT = -9.99 FORMAT = "F6.2" END_OBJECT = COLUMN END_OBJECT = TABLE END Individual Mass Spectra (Cassini CDA Mass Spectrum XXXXXXXX) PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = TBD FILE_RECORDS = TBD ^TABLE = "_MP_XXXXXXXX.TAB" DATA_SET_NAME = "CASSINI CDA DATA V1.0" DATA_SET_ID = "CO-D-CDA-3/4/5-DUST-V1.0" PRODUCT_ID = "MP_XXXXXXXX" PRODUCT_NAME = "CDA MP SIGNAL TABLE" SPACECRAFT_NAME = "CASSINI ORBITER" INSTRUMENT_NAME = "COSMIC DUST ANALYSER" TARGET_NAME = "DUST" START_TIME = "TBD" STOP_TIME = "TBD" PRODUCT_CREATION_TIME = "2005-173T14:20:22" RECORD_FORMAT = "(F6.2,1X,F5.2)" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = TBD COLUMNS = 2 ROW_BYTES = TBD DESCRIPTION = "Signal value at the ion multiplier" OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "OFFSET_TIME" UNIT = "MICROSECONDS" DESCRIPTION = "Flight time measured from estimated time of impact." DATA_TYPE = "ASCII_REAL" START_BYTE = 1 BYTES = 6 MISSING_CONSTANT = 999 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "AMPLITUDE" UNIT = "MICROVOLTS" DESCRIPTION = "Signal value provided by the multiplier channel." DATA_TYPE = "ASCII_REAL" START_BYTE = 8 BYTES = 5 MISSING_CONSTANT = -9.99 FORMAT = "F5.2" END_OBJECT = COLUMN END_OBJECT = TABLE END Cassini CDA Signals Table (Cassini CDA Individual Signals XXXXXXXX) QI Signal Table (XXXXXXXX) PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = TBD FILE_RECORDS = TBD ^TABLE = "_QI_XXXXXXXX.TAB" DATA_SET_NAME = "CASSINI CDA DATA V1.0" DATA_SET_ID = "CO-D-CDA-3/4/5-DUST-V1.0" PRODUCT_ID = "QI_XXXXXXXX" PRODUCT_NAME = "CDA QI SIGNAL TABLE" SPACECRAFT_NAME = "CASSINI ORBITER" INSTRUMENT_NAME = "COSMIC DUST ANALYSER" TARGET_NAME = "DUST" START_TIME = "TBD" STOP_TIME = "TBD" PRODUCT_CREATION_TIME = "2005-173T14:20:22" RECORD_FORMAT = "(F6.2,1X,E8.1)" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = TBD COLUMNS = 2 ROW_BYTES = TBD DESCRIPTION = "Ion charge signal generated by an impact." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "OFFSET_TIME" UNIT = "MICROSECONDS" DESCRIPTION = "Time after triggering event." DATA_TYPE = "ASCII_REAL" START_BYTE = 1 BYTES = 6 MISSING_CONSTANT = 999 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "RECONSTRUCTED_QI_CHARGE" UNIT = "COULOMBS" DESCRIPTION = "Calibrated QI charge at time elapsed after triggering event." DATA_TYPE = "ASCII_REAL" START_BYTE = 8 BYTES = 8 MISSING_CONSTANT = -9.E99 FORMAT = "E8.1" END_OBJECT = COLUMN END_OBJECT = TABLE END QT Signal Table (XXXXXXXX) PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = TBD FILE_RECORDS = TBD ^TABLE = "_QT_XXXXXXXX.TAB" DATA_SET_NAME = "CASSINI CDA DATA V1.0" DATA_SET_ID = "CO-D-CDA-3/4/5-DUST-V1.0" PRODUCT_ID = "QT_XXXXXXXX" PRODUCT_NAME = "CASSINI CDA DUST ANALYSER QT SIGNAL TABLE" SPACECRAFT_NAME = "CASSINI ORBITER" INSTRUMENT_NAME = "COSMIC DUST ANALYSER" TARGET_NAME = "DUST" START_TIME = "TBD" STOP_TIME = "TBD" PRODUCT_CREATION_TIME = "2005-173T14:20:22" RECORD_FORMAT = "(F6.2,1X,E8.1)" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = TBD COLUMNS = 2 ROW_BYTES = TBD DESCRIPTION = "Electron charge signal monitored at the IID target generated by an impact." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "OFFSET_TIME" UNIT = "MICROSECONDS" DESCRIPTION = "Time after triggering event." DATA_TYPE = "ASCII_REAL" START_BYTE = 1 BYTES = 6 MISSING_CONSTANT = 999 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "RECONSTRUCTED_QT_CHARGE" UNIT = "COULOMBS" DESCRIPTION = "Calibrated QT charge at time elapsed after triggering event." DATA_TYPE = "ASCII_REAL" START_BYTE = 8 BYTES = 8 MISSING_CONSTANT = -9.E99 FORMAT = "E8.1" END_OBJECT = COLUMN END_OBJECT = TABLE END QC Signal Table (XXXXXXXX) PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = TBD FILE_RECORDS = TBD ^TABLE = "_QC_XXXXXXXX.TAB" DATA_SET_NAME = "CASSINI CDA DATA V1.0" DATA_SET_ID = "CO-D-CDA-3/4/5-DUST-V1.0" PRODUCT_ID = "QC_XXXXXXXX" PRODUCT_NAME = "CASSINI CDA DUST ANALYSER QC SIGNAL TABLE" SPACECRAFT_NAME = "CASSINI ORBITER" INSTRUMENT_NAME = "COSMIC DUST ANALYSER" TARGET_NAME = "DUST" START_TIME = "TBD" STOP_TIME = "TBD" PRODUCT_CREATION_TIME = "2005-173T14:20:22" RECORD_FORMAT = "(F6.2,1X,E8.1)" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = TBD COLUMNS = 2 ROW_BYTES = TBD DESCRIPTION = "Electron charge signal monitored at the CAT target generated by an impact." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "OFFSET_TIME" UNIT = "MICROSECONDS" DESCRIPTION = "Time after triggering event." DATA_TYPE = "ASCII_REAL" START_BYTE = 1 BYTES = 6 MISSING_CONSTANT = 999 FORMAT = "F6.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "RECONSTRUCTED_QC_CHARGE" UNIT = "COULOMBS" DESCRIPTION = "Calibrated QC charge at time elapsed after triggering event." DATA_TYPE = "ASCII_REAL" START_BYTE = 8 BYTES = 8 MISSING_CONSTANT = -9.E99 FORMAT = "E8.1" END_OBJECT = COLUMN END_OBJECT = TABLE END QP Signal Table (XXXXXXXX) PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = TBD FILE_RECORDS = TBD ^TABLE = "_QP_XXXXXXXX.TAB" DATA_SET_NAME = "CASSINI CDA DATA V1.0" DATA_SET_ID = "CO-D-CDA-3/4/5-DUST-V1.0" PRODUCT_ID = "QP_XXXXXXXX" PRODUCT_NAME = "CDA QP SIGNAL TABLE" SPACECRAFT_NAME = "CASSINI ORBITER" INSTRUMENT_NAME = "COSMIC DUST ANALYSER" TARGET_NAME = "DUST" START_TIME = "TBD" STOP_TIME = "TBD" PRODUCT_CREATION_TIME = "2005-173T14:20:22" RECORD_FORMAT = "(F8.2,1X,E8.1)" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = TBD COLUMNS = 2 ROW_BYTES = TBD DESCRIPTION = "Charge induced by the particle on the charge grid device" OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "OFFSET_TIME" UNIT = "MICROSECONDS" DESCRIPTION = "Time after triggering event." DATA_TYPE = "ASCII_REAL" START_BYTE = 1 BYTES = 8 MISSING_CONSTANT = -999.99 FORMAT = "F8.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "RECONSTRUCTED_QP_CHARGE" UNIT = "COULOMBS" DESCRIPTION = "Calibrated QP charge at time elapsed after triggering event." DATA_TYPE = "ASCII_REAL" START_BYTE = 10 BYTES = 8 MISSING_CONSTANT = -9.E99 FORMAT = "E8.1" END_OBJECT = COLUMN END_OBJECT = TABLE END Cassini CDA Settings Table PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 84 FILE_RECORDS = 256 ^TABLE = "CDASETTINGS.TAB" DATA_SET_NAME = "CASSINI CDA DATA V1.0" DATA_SET_ID = "CO-D-CDA-3/4/5-DUST-V1.0" PRODUCT_ID = "CDA_SETTINGS" PRODUCT_NAME = "CASSINI CDA SETTINGS TABLE" SPACECRAFT_NAME = "CASSINI ORBITER" INSTRUMENT_NAME = "COSMIC DUST ANALYSER" TARGET_NAME = "DUST" START_TIME = "N/A" STOP_TIME = "N/A" PRODUCT_CREATION_TIME = "2005-06-27T15:21:50" RECORD_FORMAT = "(I2,1X,E8.2,1X,I2,1X,E8.2,1X,I2,1X,E8.2,1X,I2,1X,E8.2,1X,I2,2(1X,I3),1X,I5, 1X,I1,1X,I4,1X,I3,1X,I4)" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = 256 COLUMNS = 16 ROW_BYTES = 84 DESCRIPTION = "Table of voltages corresponding to voltage level codes and coulomb threshold settings. Refer to SRAMAETAL2004B for a detailed description of the CDA settings." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "QC_THRESHOLD_SETTING" DESCRIPTION = "Code corresponding to the threshold setting for the amplifier connected to the chemical analyser target. Values are between 0 and 15." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 1 BYTES = 2 MISSING_CONSTANT = 99 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "QC_THRESHOLD_SETTING_COULOMB" UNIT = "COULOMBS" DESCRIPTION = "Value in Coulomb corresponding to the code value." DATA_TYPE = "ASCII_REAL" START_BYTE = 4 BYTES = 8 MISSING_CONSTANT = 9.99E-99 FORMAT = "E8.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "QA_THRESHOLD_SETTING" DESCRIPTION = "Code corresponding to the threshold setting for the amplifier connected to the chemical analyser grid. Values are between 0 and 15." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 13 BYTES = 2 MISSING_CONSTANT = 99 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "QA_THRESHOLD_SETTING_COULOMB" UNIT = "COULOMBS" DESCRIPTION = "Value in Coulomb corresponding to the code value." DATA_TYPE = "ASCII_REAL" START_BYTE = 16 BYTES = 8 MISSING_CONSTANT = 9.99E-99 FORMAT = "E8.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "QT_THRESHOLD_SETTING" DESCRIPTION = "Code corresponding to the threshold setting for the amplifier connected to the impact ionisation target. Values are between 0 and 15." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 25 BYTES = 2 MISSING_CONSTANT = 99 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "QT_THRESHOLD_SETTING_COULOMB" UNIT = "COULOMBS" DESCRIPTION = "Value in Coulomb corresponding to the code value." DATA_TYPE = "ASCII_REAL" START_BYTE = 28 BYTES = 8 MISSING_CONSTANT = 9.99E-99 FORMAT = "E8.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "QI_THRESHOLD_SETTING" DESCRIPTION = "Code corresponding to the threshold setting for the amplifier connected to the ion grid. Values are between 0 and 15." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 37 BYTES = 2 MISSING_CONSTANT = 99 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "QI_THRESHOLD_SETTING_COULOMB" UNIT = "COULOMBS" DESCRIPTION = "Value in Coulomb corresponding to the code value." DATA_TYPE = "ASCII_REAL" START_BYTE = 40 BYTES = 8 MISSING_CONSTANT = 9.99E-99 FORMAT = "E8.2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "QMA_THRESHOLD_SETTING" DESCRIPTION = "Code corresponding to the threshold setting for the amplifier connected to the multiplier anode. Values are between 0 and 15." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 49 BYTES = 2 MISSING_CONSTANT = 99 FORMAT = "I2" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "QMA_THRESHOLD_VOLTAGE" UNIT = "MILLIVOLT" DESCRIPTION = "Value in Millivolt corresponding to the code value." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 52 BYTES = 3 MISSING_CONSTANT = -99 FORMAT = "I3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "MULTIPLIER_VOLTAGE_LEVEL" DESCRIPTION = "The multiplier high voltage setting, in steps between 0 and 255." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 56 BYTES = 3 MISSING_CONSTANT = 999 FORMAT = "I3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "MULTIPLIER_VOLTAGE" UNIT = "VOLT" DESCRIPTION = "Multiplier high voltage setting values." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 60 BYTES = 5 MISSING_CONSTANT = -9999 FORMAT = "I5" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 NAME = "ION_GRID_VOLTAGE_LEVEL" DESCRIPTION = "The ion grid high voltage setting in steps between 0 and 3." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 66 BYTES = 1 MISSING_CONSTANT = 9 FORMAT = "I1" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 NAME = "ION_GRID_VOLTAGE" UNIT = "VOLT" DESCRIPTION = "Ion grid voltage setting value." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 68 BYTES = 4 MISSING_CONSTANT = -999 FORMAT = "I4" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 15 NAME = "CHEMICAL_ANALYSER_VOLTAGE_LEVEL" DESCRIPTION = "The chemical analyser high voltage setting in steps between 0 and 255." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 73 BYTES = 3 MISSING_CONSTANT = 999 FORMAT = "I3" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 16 NAME = "CHEMICAL_ANALYSER_VOLTAGE" UNIT = "VOLT" DESCRIPTION = "Chemical analyser voltage setting value." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 77 BYTES = 4 MISSING_CONSTANT = -999 FORMAT = "I4" END_OBJECT = COLUMN END_OBJECT = TABLE END Cassini CDA Counter Table PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = TBD FILE_RECORDS = TBD ^TABLE = "CDACOUNTER.TAB" DATA_SET_NAME = "CASSINI CDA DATA V1.0" DATA_SET_ID = "CO-D-CDA-3/4/5-DUST-V1.0" PRODUCT_ID = "CDA-COUNTER" PRODUCT_NAME = "CDA COUNTER STATE TABLE" SPACECRAFT_NAME = "CASSINI ORBITER" INSTRUMENT_NAME = "COSMIC DUST ANALYSER" TARGET_NAME = "DUST" START_TIME = "TBD" STOP_TIME = "TBD" PRODUCT_CREATION_TIME = "2005-173T14:20:22" RECORD_FORMAT = "(A17,20(1X,I8))" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = TBD COLUMNS = 21 ROW_BYTES = TBD DESCRIPTION = "Table of counter values." OBJECT = COLUMN COLUMN_NUMBER = 1 NAME = "TIME" DESCRIPTION = "Time when the counter state snapshot was taken, given in UTC (years, day of year, hours, minutes, and seconds) in the general form:yyyy-dddThh:mm:ss. Uncertainty is about 1 second." DATA_TYPE = "CHARACTER" START_BYTE = 1 BYTES = 17 FORMAT = "A17" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 2 NAME = "COUNTER_0" DESCRIPTION = "State of counter 0 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 19 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 3 NAME = "COUNTER_1" DESCRIPTION = "State of counter 1 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 28 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 4 NAME = "COUNTER_2" DESCRIPTION = "State of counter 2 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 37 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 5 NAME = "COUNTER_3" DESCRIPTION = "State of counter 3 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 46 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 6 NAME = "COUNTER_4" DESCRIPTION = "State of counter 4 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 55 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 7 NAME = "COUNTER_5" DESCRIPTION = "State of counter 5 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 64 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 8 NAME = "COUNTER_6" DESCRIPTION = "State of counter 6 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 73 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 9 NAME = "COUNTER_7" DESCRIPTION = "State of counter 7 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 82 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 10 NAME = "COUNTER_8" DESCRIPTION = "State of counter 8 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 91 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 11 NAME = "COUNTER_9" DESCRIPTION = "State of counter 9 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 100 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 12 NAME = "COUNTER_10" DESCRIPTION = "State of counter 10 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 109 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 13 NAME = "COUNTER_11" DESCRIPTION = "State of counter 11 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 118 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 14 NAME = "COUNTER_12" DESCRIPTION = "State of counter 12 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 127 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 15 NAME = "COUNTER_13" DESCRIPTION = "State of counter 13 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 136 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 16 NAME = "COUNTER_14" DESCRIPTION = "State of counter 14 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 145 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 17 NAME = "COUNTER_15" DESCRIPTION = "State of counter 15 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 154 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 18 NAME = "COUNTER_16" DESCRIPTION = "State of counter 16 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 163 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 19 NAME = "COUNTER_17" DESCRIPTION = "State of counter 17 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 172 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 20 NAME = "COUNTER_18" DESCRIPTION = "State of counter 18 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 181 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN OBJECT = COLUMN COLUMN_NUMBER = 21 NAME = "COUNTER_19" DESCRIPTION = "State of counter 19 at the time of the snapshot." DATA_TYPE = "ASCII_INTEGER" START_BYTE = 190 BYTES = 8 MISSING_CONSTANT = -99 FORMAT = "I8" END_OBJECT = COLUMN END_OBJECT = TABLE END APPENDIX 2 Ð PROVISIONAL CDA PRODUCT COLUMN DESCRIPTIONS Cassini CDA Area Table # Name Start Byte Format Units Description 1 1. SENSOR AXIS ANGLE 1 I2 Degrees This is the angle to the sensor axis where zero is along the axis. 2 IMPACT DETECTOR AREA 4 F6.4 Meter**2 The exposed sensitive area of the CDA impact detector corresponding to the projected area of the hemispherical detector visible to an incoming particle traveling along a path at the SENSOR AXIS ANGLE. 3 CHEMICAL ANALYSER AREA 11 F6.4 Meter**2 The exposed sensitive area of the CDA chemical analyser corresponding to the projected area of the hemispherical detector visible to an incoming particle traveling along a path at the SENSOR AXIS ANGLE. 4 TOTAL AREA 18 F6.4 Meter**2 The total exposed sensitive area of the CDA corresponding to the projected area of the hemispherical detector visible to an incoming particle traveling along a path at the SENSOR AXIS ANGLE. Cassini CDA Status History # Name Start Byte Format Units Description 1 EVENT TIME 1 A17 The UTC time given in year, day of year, hours, minutes, and seconds in the general form: yyyy-dddThh:mm:ss. 2 EVENT DEFINITION 19 A5 A five digit integer which indicates which detectors can trigger a particle detection, coded as follows: Column Detector 1 QT 2 QC 3 QA 4 QI 5 QMA where the column value is 0 if the detector is switched off, and 1 if the detector is switched on. 4 QC THRESHOLD SETTING 25 I2 Code corresponding to the threshold setting at the time of impact for the amplifier connected to the chemical analyser target. Values are between 0 and 15. Conversion to Coulombs is dependent upon rise time and is found in CDASETTINGS.TAB. 5 QA THRESHOLD SETTING 28 I2 Code corresponding to the threshold setting at the time of impact for the amplifier connected to the chemical analyser grid. Values are between 0 and 15. Conversion to Coulombs is dependent upon rise time and is found in CDASETTINGS.TAB. 6 QT THRESHOLD SETTING 31 I2 Code corresponding to the threshold setting at the time of impact for the amplifier connected to the impact ionization grid. Values are between 0 and 15. Conversion to Coulombs is dependent upon rise time and is found in CDASETTINGS.TAB. 7 QI THRESHOLD SETTING 34 I2 Code corresponding to the threshold setting at the time of impact for the amplifier connected to the ion grid. Values are between 0 and 15. Conversion to Coulombs is dependent upon rise time and is found in CDASETTINGS.TAB. 8 QMA THRESHOLD SETTING 37 I2 Code corresponding to the threshold setting at the time of impact for the amplifier connected to the multiplier anode. Values are between 0 and 15. Conversion to Volts is found in CDASETTINGS.TAB. 9 MULTIPLIER VOLTAGE LEVEL 40 I3 The multiplier high voltage level setting, in steps between 0 and 255. Corresponding voltages are found in CDASETTINGS.TAB. 10 ION GRID VOLTAGE LEVEL 44 I3 The ion grid high voltage level setting, in steps between 0 and 255. Corresponding voltages are found in CDASETTINGS.TAB. 11 CHEMICAL ANALYSER VOLTAGE LEVEL 48 I3 The chemical analyser high voltage level setting, in steps between 0 and 255. Corresponding voltages are found in CDASETTINGS.TAB. 12 LISTEN FLAG 52 I1 A flag indicating that CDA was in a measurement mode (1) or not (0). 13 HARD STATUS 54 I1 Code indicating whether CDA was on (1) or off (0). 14 QI SHRINKING 56 I1 A description of the degree of lossy data compression applied to the transmitted the time-resolved ion grid signal (QI), where there is no compression (1) or compression by factors of 2 (2) or 4 (4). 15 QC SHRINKING 58 I1 A description of the degree of lossy data compression applied to the transmitted time-resolved chemical analyzer target signal (QC), where there is no compression (1) or compression by factors of 2 (2) or 4 (4). 16 QT SHRINKING 60 I1 A description of the degree of lossy data compression applied to the transmitted time-resolved impact ionization target signal (QT), where there is no compression (1) or compression by factors of 2 (2) or 4 (4). 17 QP SHRINKING 62 I1 A description of the degree of lossy data compression applied to the transmitted time-resolved signal at the charge sensitive entrance grids (QP), where there is no compression (1) or compression by factors of 2 (2) or 4 (4). 18 MP SHRINKING 64 I1 A description of the degree of lossy data compression applied to the transmitted time-resolved time of flight mass spectrum (MP), where there is no compression (1) or compression by factors of 2 (2) or 4 (4). 20 ARTICULATION POSITION 66 I3 CDA articulation position on the turntable given in degrees. The CDA instrument boresight within the S/C coordinate systems depends upon the position a as: x = 1/8 ( -1 - SQRT(3) + (-1 + SQRT(3)) COS(a) - 2 SQRT(6) SIN(a) ) y = 1/8 ( 3 + SQRT(3) + (-3 + SQRT(3)) COS(a) - 2 SQRT(2) SIN(a) ) z = 1/4 ( -1 + SQRT(3) + ( 1 + SQRT(3)) COS(a) ) Cassini CDA Dust Analyser Event Table # Name Start Byte Format Units Definition 1 EVENT ID 1 I10 An identifier number associated with an event. 2 EVENT TIME 12 A17 The UTC time of an event given in year, day of year, hours, minutes, and seconds in the general form: yyyy-dddThh:mm:ss. Uncertainty is smaller than 1 second. 3 EVENT JULIAN DATE 30 F14.6 Days The full Julian date of an event. Uncertainty is smaller than 1 second. 4 QP AMPLITUDE 45 E8.1 Coulombs Amplitude of the entrance grid channel signal. In case od a dust impact event, particle charge as measured by the signal maximum. 5 QP SIGNAL FLAG 54 I1 This flag is set to 1 if a charge signal is provided for this event. 6 QI AMPLITUDE 56 E8.1 Coulombs Amplitude of the signal monitored by the integrating amplifier connected to the ion grid. In case of a dust impact event, fraction of the plasma ion charge yield generated by the particle impact. 7 QI SIGNAL FLAG 65 I1 This flag is set to 1 if a charge signal is provided for this event. 8 QT AMPLITUDE 67 E8.1 Coulombs Amplitude of the signal monitored by the integrating amplifier connected to the impact ionization target (IID). In case of a dust impact event, fraction of the plasma electron charge yield generated by the particle impact. 9 QT SIGNAL FLAG 76 I1 This flag is set to 1 if a charge signal is provided for this event 10 QC AMPLITUDE 78 E8.1 Coulombs Amplitude of the signal monitored by the integrating amplifier connected to the chemical analyser target (CAT). In case of a dust impact event, fraction of the plasma electron charge yield generated by the particle impact. 11 QC SIGNAL FLAG 87 I1 This flag is set to 1 if a charge signal is provided for this event 12 QI RISE TIME 89 E8.1 Seconds The signal from the ion grid is reconstructed and converted to Coulomb. The rise time is that time elapsed between 10% and 90% of the signal maximum. The error on the rise time is set by the channel sampling rate and is of 166.6E-9 s. In case of a noise event, or if the signal amplitude is zero, the rise time is set to its missing value. 13 QT RISE TIME 98 E8.1 Seconds The signal from the impact ionization detector is reconstructed and converted to Coulomb. The rise time is that time elapsed between 10% and 90% of the signal maximum. The error on the rise time is set by the channel sampling rate and is of 333.3E-9 s. In case of a noise event, or if the signal amplitude is zero, the rise time is set to its missing value. 14 QC RISE TIME 107 E8.1 Seconds The signal from the chemical analyzer target is reconstructed and converted to Coulomb. The rise time is that time elapsed between 10% and 90% of the signal maximum. The error on the rise time is set by the channel sampling rate and is of 166.6E-9 s. In case of a noise event, or if the signal amplitude is zero, the rise time is set to its missing value. 15 TARGET FLAG 116 I1 The target flag (TF) indicates that portion of the target impacted. TF Portion 0 Unknown 1 Chemical Analyser 2 IID 3 QP grid 4 CAT grid 5 wall impact 16 SPACECRAFT RIGHT ASCENSION 118 F7.2 Degrees The heliocentric right ascension (J2000) of the spacecraft. 17 SPACECRAFT DECLINATION 126 F7.2 Degrees The heliocentric declination (J2000) of the spacecraft. 18 SPACECRAFT-SUN DISTANCE 134 F6.4 AU The distance from the spacecraft to the sun. 19 SPACECRAFT SATURN SYSTEM III LONGITUDE 141 F7.2 Degrees The sub-Saturn longitude of the spacecraft in the System III coordinates: +z is the pole axis of Saturn, xy the ring plane. +x is the projection of the J2000 vernal equinox direction onto the ring plane. 20 SPACECRAFT SATURN SYSTEM III LATITUDE 149 F7.2 Degrees The sub-Saturn latitude of the spacecraft in the System III coordinates.+x is the projection of the J2000 vernal equinox direction onto the ring plane. 21 SPACECRAFT- SATURN DISTANCE 157 F8.2 RS The distance from the spacecraft to Saturn in Saturnian radii. 22 SPACECRAFT X VELOCITY 166 F6.2 Km/sec The J2000 heliocentric equatorial X component of the Cassini velocity vector. 23 SPACECRAFT Y VELOCITY 173 F6.2 Km/sec The J2000 heliocentric equatorial Y component of the Cassini velocity vector. 24 SPACECRAFT Z VELOCITY 180 F6.2 Km/sec The J2000 heliocentric equatorial Z component of the Cassini velocity vector. 25 DETECTOR RIGHT ASCENSION 187 F7.2 Degrees The spacecraft-centered right ascension (J2000) of the sensor axis. 26 DETECTOR DECLINATION 195 F7.2 Degrees The spacecraft-centered declination (J2000) of the sensor axis. 27 COUNTER NUMBER 203 I2 Event counter assigned by the on-board event evaluation algorithm with a value between 0 and 19. The event counter value is a rough measure for the properties of the registered event. 28 EVENT QUALITY 206 I3 Event qua;ity assigned by the on-board event evaluation algorithm. The evnt class takes values between0 and 4 and is a rough measure for the quality of the event 0 Ð noise, 1- test pulse, 2- small impatc, 3- strong impact, 4- impacts with TOF mass spectrum. 29 PARTICLE SPEED 210 F5.1 Km/sec The impact speed of the particle relative to the spacecraft. When no speed can be determined, or in case of a noise event, the value is set to its missing value. 30 PARTICLE SPEED ERROR FACTOR 216 F4.1 An upper and lower estimate of impactor speed relative to the spacecraft is obtained by multiplying and dividing, respectively, the particle speed by this factor. When no speed (hence error factor) can be determined, the value of this factor is set to its missing value. 31 PARTICLE MASS 221 E8.1 Kilogram The particle mass. When the particle speed is not determined, the mass is not determined and is set to its missing value. 32 PARTICLE MASS ERROR FACTOR 230 F4.1 An upper and lower estimate of impactor mass is obtained by multiplying and dividing, respectively, the particle mass by this factor. When the speed is not determined, neither is the mass, and this factor is set to its missing value, 33 PARTICLE CHARGE 235 E8.1 Coulomb The charge of particle derived from the entrance grid signal. When no charge can be determined, the value is set to its missing value. 34 PARTICLE CHARGE ERROR 244 E8.1 Coulomb The error associated with the particle charge. 35 SPECTRUM FLAG 253 I1 A flag indicating if there exists a corresponding mass spectrum for the particle (1) or not (0). Cassini CDA Spectra Peaks Table # Name Start Byte Format Units Description 1 IMPACT EVENT ID 1 I10 An identifier number associated with a dust impact with a TOF mass spectrum. 2 NUMBER PEAKS 12 I2 The number of distinguishable peaks in the mass spectrum of an impacting particle. 3 SCALE ID 15 I2 Identifier flag showing how the mass scale was calculated. 0: from impact time only, 1: from impact time and first peak, 2: from two reference peaks. 4 SCALE POS 1 18 E10.3 Seconds Reference position (time) of the first peak for mass scale calculation, in second from trigger time. 5 SCALE POS 2 29 E10.3 Seconds Reference position (time) of the second peak for mass scale calculation, in second from trigger time. 6 PEAK 1 FLIGHT TIME 40 E10.3 Seconds Time elapsed between Mass Analyser triggering and first spectral peak. 7 PEAK 1 FLIGHT TIME UNCERTAINTY 51 E10.3 Seconds The uncertainty in the time elapsed between Mass Analyser triggering and first spectral peak. 9 PEAK 1 AMPLITUDE 62 E10.3 Volts This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data. 9 PEAK 1 INTEGRAL 73 E10.3 Volt Seconds The peak integral is area below the amplitude curve. The integral is calculated on the processed data (x = time scale, y = volt-scale). 10 PEAK 1 MASS 84 F6.2 AMU Atomic weight corresponding to 1st mass peak. É 55 PEAK 11 FLIGHT TIME 550 E10.4 Seconds Time elapsed between Mass Analyser triggering and 11th spectral peak. 56 PEAK 11 FLIGHT TIME UNCERTAINTY 561 E10.4 Seconds The uncertainty in the time elapsed between Mass Analyser triggering and twelfth spectral peak. 57 PEAK 11 AMPLITUDE 572 E10.4 Volts This is the peak amplitude in volts at the multiplier. The peak amplitude is determined in the processed data. 58 PEAK 11 INTEGRAL 583 E10.4 Volt Seconds The peak integral is area below the amplitude curve. The integral is calculated on the processed data (x = timescale, y = volt-scale). 59 PEAK 11 MASS 594 F5.2 AMU Atomic weight corresponding to 11th mass peak. MP Signal Table # Name Start Byte Format Units Description 1 OFFSET TIME 1 F6.2 Microsecon ds Flight time measured from estimated time of impact. 2 AMPLITUDE 8 F5.2 Microvolts Signal value provided by the multiplier channel QI Signal Table # Name Start Byte Format Units Description 1 OFFSET TIME 1 F6.2 Microsecon ds Time elapsed after event triggering 2 RECONSTRUCTED QI CHARGE 8 E8.1 Coulombs Calibrated QI charge at time elapsed after event triggering. QT Signal Table # Name Start Byte Format Units Description 1 OFFSET TIME 1 F6.2 Microsecon ds Time elapsed after event triggering 2 RECONSTRUCTED QT CHARGE 8 E8.1 Coulombs Calibrated QT charge at time elapsed after event triggering. QC Signal Table # Name Start Byte Format Units Description 1 OFFSET TIME 1 F6.2 Microsecon ds Time elapsed after event triggering 2 RECONSTRUCTED QT CHARGE 8 E8.1 Coulombs Calibrated QC charge at time elapsed after event triggering. Cassini CDA QP Signal Table (Cassini CDA Charge Grid signal XXXXXXX) # Name Start Byte Format Units Description 1 OFFSET TIME 1 F8.2 Microsecon ds Time measured from estimated impact time Negative time values correspond to time values before the impact time, positive values after the impact time. 2 RECONSTRUCTED QP CHARGE 10 E8.1 Coulombs Charge induced by the dust particle at the charge grid device. Cassini CDA Settings Table # Name Start Byte Format Units Description 1 QC THRESHOLD SETTING 1 I2 Code corresponding to the threshold setting for the amplifier connected to the chemical analyzer target. Values are between 0 and 15 2 QC THRESHOLD SETTING COULOMB 4 E8.2 Coulombs Value in Coulombs corresponding to the code value 3 QA THRESHOLD SETTING 13 I2 Code corresponding to the threshold setting for the amplifier connected to the chemical analyser grid. Values are between 0 and 15 4 QA THRESHOLD SETTING COULOMB 16 E8.2 Coulombs Value in Coulombs corresponding to the code value 5 QT THRESHOLD SETTING 25 I2 Code corresponding to the threshold setting for the amplifier connected impact ionization target. Values are between 0 and 15 6 QT THRESHOLD SETTING COULOMB 28 E8.2 Coulombs Value in Coulombs corresponding to the code value 7 QI THRESHOLD SETTING 37 I2 Code corresponding to the threshold setting for the amplifier connected to the ion grid. Values are between 0 and 15 8 QI THRESHOLD SETTING COULOMB 40 E8.2 Coulombs Value in Coulombs corresponding to the code value 9 QMA THRESHOLD SETTING 49 I2 Code corresponding to the threshold setting at the time of impact for the amplifier connected to the multiplier anode. Values are between 0 and 15. 10 QMA THRESHOLD SETTING VOLTAGE 52 I3 Volt Value in Volts corresponding to the code value 11 MULTIPLIER VOLTAGE LEVEL 56 I3 The multiplier high voltage level setting, in steps between 0 and 255. 12 MULTIPLIER VOLTAGE 60 I5 Volt Multiplier high voltage setting values 13 ION GRID VOLTAGE LEVEL 66 I1 The ion grid high voltage level setting, in steps between 0 and 3. 14 ION GRID VOLTAGE 68 I4 Volt Ion grid high voltage setting values. 15 CHEMICAL ANALYSER VOLTAGE LEVEL 73 I3 The chemical analyser high voltage level setting, in steps between 0 and 255. 16 CHEMICAL ANALYSER VOLTAGE 77 I4 Volt Chemical analyzer high voltage setting values Cassini CDA Counter Table # Name Start Byte Format Units Description 1 TIME 1 A17 Time when the counter state snapshot was taken, given in UTC (years, hours, minutes, and seconds in the general form: yyyy- dddThh:mm:ss.) Uncertainty is about 1 second. 2 COUNTER 0 19 I8 State of counter 0 at the time of the snapshot 3 COUNTER 1 28 I8 State of counter 1 at the time of the snapshot 4 COUNTER 2 37 I8 State of counter 2 at the time of the snapshot 5 COUNTER 3 46 I8 State of counter 3 at the time of the snapshot 6 COUNTER 4 55 I8 State of counter 4 at the time of the snapshot 7 COUNTER 5 64 I8 State of counter 5 at the time of the snapshot 8 COUNTER 6 73 I8 State of counter 6 at the time of the snapshot 9 COUNTER 7 82 I8 State of counter 7 at the time of the snapshot 10 COUNTER 8 91 I8 State of counter 8 at the time of the snapshot 11 COUNTER 9 100 I8 State of counter 9 at the time of the snapshot 12 COUNTER 10 109 I8 State of counter 10 at the time of the snapshot 13 COUNTER 11 118 I3 State of counter 11 at the time of the snapshot 14 COUNTER 12 127 I8 State of counter 12 at the time of the snapshot 15 COUNTER 13 136 I8 State of counter 13 at the time of the snapshot 16 COUNTER 14 145 I8 State of counter 14 at the time of the snapshot 17 COUNTER 15 154 I8 State of counter 15 at the time of the snapshot 18 COUNTER 16 163 I8 State of counter 16 at the time of the snapshot 19 COUNTER 17 172 I8 State of counter 17 at the time of the snapshot 20 COUNTER 18 181 I8 State of counter 18 at the time of the snapshot 21 COUNTER 19 190 I8 State of counter 19 at the time of the snapshot However, it must be stressed that this estimate is uncertain by at least a factor of 10.