ROSETTA-RPC-IES PLANETARY SCIENCE ARCHIVE INTERFACE CONTROL DOCUMENT MAY 2008 SwRI Project 10991 Document No. 10991-IES-EAICD-01 Contract JPL 1200670 Prepared by ROSETTA-RPC-IES PLANETARY SCIENCE ARCHIVE INTERFACE CONTROL DOCUMENT SwRI Project 10991 Document No. 10991-IES-EAICD-01 Contract JPL 1200670 Prepared by: Brad Trantham 31 August 2007 Archivist Approved by: ____________________________________ Date: ____________ James L. Burch, PhD, Principal Investigator Approved by: ____________________________________ Date: ____________ Raymond Goldstein, PhD, Rosetta Project Manager Approved by: ____________________________________ Date: ____________ L. D. McCullough, SwRI Project CM TABLE OF CONTENTS Page 1. INTRODUCTION 1 1.1 Purpose and Scope 1 1.2 Archiving Authorities 1 1.3 Contents 1 1.4 Intended Readership 2 1.5 Applicable Documents 2 1.6 Relationships to Other Interfaces 2 1.7 Acronyms and Abbreviations 2 1.8 Contact Names and Addresses 2 2. OVERVIEW OF INSTRUMENT DESIGN, DATA HANDLING PROCESS AND PRODUCT GENERATION 3 2.1 Instrument Design 3 2.2 Scientific Objectives 4 2.3 Data Handling Process 4 2.4 Overview of Data Products 4 2.5 Pre-Flight Data Products 4 2.5.1 Sub-System Tests 4 2.5.2 Instrument Calibrations 4 2.5.3 Other Files written during Calibration 4 2.5.4 In-Flight Data Products 4 2.5.5 Software 5 2.5.6 Calibration Software 5 2.5.7 Pipeline Processing Software 5 2.5.8 Scientific Analysis Software 5 2.5.9 Documentation 6 2.5.10 Derived and other Data Products 6 2.5.11 Ancillary Data Usage 6 3. ARCHIVE FORMAT AND CONTENT 6 3.1 Format and Conventions 6 3.1.1 Deliveries and Archive Volume Format 6 3.1.2 Data Set ID Formation 6 3.1.3 Data Directory Naming Convention 7 3.1.4 Filenaming Convention 7 3.2 Standards Used in Data Product Generation 8 3.2.1 PDS Standards 8 3.2.2 Time Standards 8 3.2.3 Reference Systems 8 3.2.4 Other Applicable Standards 8 3.3 Data Validation 8 3.4 Content 9 3.4.1 Volume Set 9 3.4.2 Data Set 9 3.4.3 Directories 9 3.4.3.1 Root Directory 9 3.4.3.2 Catalog Directory 10 3.4.3.3 Index Directory 10 3.4.3.4 Browse Directory and Browse Files 10 3.4.3.5 Geometry Directory 10 3.4.3.6 Document Directory 11 3.4.3.7 Data Directory 11 4. DETAILED INTERFACE SPECIFICATIONS 11 4.1 Structure and Organization Overview 11 4.2 Data Sets, Definition and Content 12 4.3 Data Product Design 12 4.3.1 Data Product Uncalibrated Design 12 REVISION NOTICE Initial Issue: September 2005. Revision 1: Updated for version 2 archive products. August 2007 Revision 1.1: Updated the directory structure under the DATA directory. May 2008 1. INTRODUCTION 1.1 Purpose and Scope The purpose of this EAICD (Experimenter to (Science) Archive Interface Control Document) is to provide users of the RPC-IES instrument data with detailed description of the product and a description of how it was generated, including data sources and destinations. It is the official interface between the instrument team and the archiving authority. 1.2 Archiving Authorities The Planetary Data System Standard is used as archiving standard by NASA for U.S. planetary missions, implemented by PDS ESA for European planetary missions, implemented by the Research and Scientific Support Department (RSSD) of ESA 1.2.1 ESAs Planetary Science Archive (PSA) ESA implements an online science archive, the PSA, to support and ease data ingestion to offer additional services to the scientific user community and science operations teams as e.g. search queries that allow searches across instruments, missions and scientific disciplines several data delivery options as direct download of data products, linked files and data sets ftp download of data products, linked files and data sets The PSA aims for online ingestion of logical archive volumes and will offer the creation of physical archive volumes on request. 1.3 Contents This document describes the data flow of the IES instrument on the Rosetta mission from the spacecraft until the insertion into the PSA for ESA. It includes information on how data were processed, formatted, labeled and uniquely identified. The document discusses general naming schemes for data volumes, data sets, data and label files. Standards used to generate the product are explained. The design of the data set structure and the data product is given. An example data product is given in section 4.3 Data Product Design. 1.4 Intended Readership This documents intended readership includes the staff of the archiving authority (Planetary Science Archive, ESA, RSSD, design team) and any potential user of the RPC-IES data. 1.5 Applicable Documents Planetary Data System Data Archive Preparation Guide May 3, 2005 Version 0.050503, JPL D31224 Planetary Data System Standards Reference, August 1, 2003, Version 3.6, JPL, D-7669, Part 2 Rosetta Archive Generation, Validation and Transfer Plan, January 2006, RO-EST-PL-5011 Rosetta Plasma Consortium Users Manual, V 1.0, December 2003, RO-RPC-UM Ion and Electron Sensor (IES) Flight Software Requirements Document, November 14, 2000, Rev. 0 Change 0, SWRI, Document No. 8182-FSRD-01 1.6 Relationships to Other Interfaces N/A 1.7 Acronyms and Abbreviations CCSDS Consultative Committee for Space Data Systems DDS Data Distribution System ESA European Space Agency, Electrostatic Analyzer ESOC European Space Operations Centre HGRTN Heliocentric Radial-Tangential-Normal IES Ion and Electron Sensor IESGS IES Ground System MCP Microchannel Plate PDS Planetary Data System PSA Planetary Science Archive RDDS Rosetta Data Distribution System RPC Rosetta Plasma Consortium 1.8 Contact Names and Addresses Brad Trantham btrantham@swri.org Southwest Research Institute Space Science and Engineering Division 6220 Culebra Road, San Antonio, Texas 78238-5166 Telephone (210) 522-5241 Fax (210) 543-0052 Dr. Ray Goldstein rgoldstein@swri.org Southwest Research Institute Space Science and Engineering Division 6220 Culebra Road, San Antonio, Texas 78238-5166 Telephone (210) 522-6223 Fax (210) 543-0052 Rob Thorpe rthorpe@swri.org Southwest Research Institute Space Science and Engineering Division 6220 Culebra Road, San Antonio, Texas 78238-5166 Telephone (210) 522-2848 Fax (210) 543-0052 2. OVERVIEW OF INSTRUMENT DESIGN, DATA HANDLING PROCESS AND PRODUCT GENERATION 2.1 Instrument Design The IES for Rosetta is an electrostatic analyzer (ESA), featuring electrostatic angular deflection to obtain a field of view of 90 x 360. The instrument objective is to obtain ion and electron distribution functions over the energy range extending from 1 eV/e up to 22 keV/e. The angular resolution for electrons is 5 x 22.5 (16 azimuthal and 16 polar-angle sectors). For ions the angular resolution is 5 x 45 (16 azimuthal and 8 polar-angle sectors) with additional segmentation to 5 x 5 in the 45 polar-angle sector most likely to contain the solar wind (giving a total of 16 polar-angle sectors for ions). The back-to-back top hat geometry of the IES electrostatic analyzer allows it to analyze both electrons and positive ions with a single entrance aperture. The IES top hat analyzers have toroidal geometry with a smaller radius of curvature in the deflection plane than in the orthogonal plane. This toroidal feature results in a flat deflection plate geometry at the poles of the analyzers and has the advantage that the focal point is located outside the analyzers rather than within them, as is the case with spherical top hat analyzers. Particles within a narrow 4% energy pass band will pass through the analyzers and be focused onto the electron and ion microchannel plates (MCPs), which produce charge pulses on 16 discrete anodes, which define the polar acceptance angles. In addition, the IES entrance aperture contains electrostatic deflection electrodes, which expand its azimuthal angle field of view to 45. With the typical top hat polar-angle field of view of 360, the IES acquires a total solid angle of 2.8 pi steradians. Operation of IES is controlled by its on-board software in conjunction with sets of (selectable) look up tables. A table in one set determines the sequence of voltages applied to the electrostatic analyzer, thereby selecting the energy/charge of electrons and ions entering the sensor. Likewise, a table in another set determines the sequence of voltages applied to the deflector plates, thereby defining the acceptance angle of the particles. In the typical operating mode, for each deflector voltage chosen the ESA is stepped over its range, the deflector voltage is stepped to its next value, and so on. A complete 2 voltage sequence thus determines a complete measurement cycle. Several versions of each table are stored in the instrument so different operating modes can be easily chosen. In addition, new tables can be uploaded if desired. Over 128 seconds (Normal and Burst telemetry rates) or 1024 seconds (Minimal telemetry rate), the instrument obtains a full measurement of ion and electron flux within 16 azimuthal bins, 16 elevation bins and 128 energy bins, for a total of 65536 values (2x16x16x128) per measurement. To fit within the data volume allocated to IES, blocks of adjacent angle/energy bins are summed together. The details of this summation are mode-dependent, but this collapse and the 128 or 1024 second accumulation time are the only differences between IES operations in different modes. 2.2 Scientific Objectives IES supports the RPC science goals by measurements of three-dimensional ion and electron velocity distributions and the derived quantities such as plasma density, flow velocity, and ion and electron pressure. 2.3 Data Handling Process All RPC data packets are transmitted together during downlinks with Rosetta. RPC data is retrieved from the DDS at ESOC to a central RPC data server at Imperial College in London. Data for IES is copied from the RPC central data server by IESGS at Southwest Research Institute. Please see section 2.5.7 for an overview of IESGS and section 1.8 for contact information. 2.4 Data Products 2.4.1 Pre-Flight Data Products None. Raw calibration data will be generated in the archive format for internal use, but there are no current plans to submit these data to the PSA. 2.4.2 Instrument Calibrations IES calibration data will be added during a later release. 2.4.3 Other Files written during Calibration None 2.4.4 In-Flight Data Products To ensure that the IES goals can be achieved, data will be archived as: Edited raw data (CODMAC level 2) the science data stream converted to human and PDS readable format. Calibrated data (CODMAC level 3) the contents of the edited raw data with calibration information included. (To be included in a future release) Derived higher level data (CODMAC level 4) quantities calculated from phase space density, such as plasma density, flow speed, ion and electron pressure, or electron pitch angle distributions. (To be included in a future release) These data may be used for cross-instrument calibrations, and both stand-alone and cross-instrument scientific analysis. Table 1: Spacecraft Science Data Products in IES Data Sets Product Data Set Type Maximum (MB / Day) Mission Total, estimated (MB) ELC Un-calibrated 33 26500 Calibrated 66 ION Un-calibrated 25 21500 Calibrated 50 DERIVED Moments 0.25 150 Electron pitch angle distributions 1.2 650 2.4.5 Software We do not intend to deliver any software. 2.4.6 Calibration Software There is no calibration software that is applicable to IES at this time. Calibration data will be included in a later release. 2.4.7 Pipeline Processing Software The pipeline processing software is the IES Ground System (IESGS). IESGS extracts IES CCSDS packets from the RPC collective data files stored on the RPC central data server at Imperial College. These packets are used to build ion and electron data products. The data products are grouped by date and written out to PDS compliant archive data files. One data file is created for each mode used in each day. IESGS also generates the labels for the archive data files. IES science products, archive and label files, and limited spectrograms are available to team scientists on the IESGS website. 2.4.8 Scientific Analysis Software Spectrograms can be generated from the IES archive data. These spectrograms can illustrate electron and ion counts per energy level, elevation angle, or azimuth bin. Spectrograms or spectrogram generating software may be introduced in a later release. 2.4.9 Documentation The document directory contains documentation that is considered to be either necessary or simply useful for users to understand the archive data set. These documents are not necessarily appropriate for inclusion in the PDS catalog. Documents may be included in multiple forms (ASCII, PDF, MS Word, HTML with image file pointers, etc.). PDS standards require that any documentation deemed required for use of the data be available in some ASCII format. HTML and PostScript are acceptable as ASCII formats in addition to plain text. Images and drawings will also be included as separate PNG files. There will be a separate directory for each document that is to be archived. Each of the document directories will include the document in plain text (ASCII) and the document in another format (i.e. .DOC or .PDF). There will also be a single label file that describes all the different formats of the included documents. When reformatting to plain text affects the information content, this will be noted in the label file. 2.4.10 Derived and other Data Products The IES higher level (derived) data products are still TBD, but may include plasma density, flow velocity, ion and electron pressure, ion and electron temperature, and ion and electron pitch angle distributions. Many of these calculations will require co-operation with other RPC instruments: Calculations of ion moments require some composition data (e.g. the mean mass to charge ratio) and electron pitch angle distributions require data on the direction of the magnetic field. 2.4.11 Ancillary Data Usage Information on additional events may be desirable, if these events affect IES data (e.g. sweeping of the LAP voltages may affect the spacecraft electron sheath and therefore IES electron data.) 3. ARCHIVE FORMAT AND CONTENT 3.1 Format and Conventions 3.1.1 Deliveries and Archive Volume Format The IES team will submit the archive to PSA and PDS electronically. PSA and PDS will be responsible for creating the physical volumes used for deep archiving. ESA requests that archive deliveries be made six months after the end of a mission phase. 3.1.2 Data Set ID Formation RO-E/M/A/C/CAL/X/SS/D-RPCIES-x-phase-Vn.m where: RO = INSTRUMENT_HOST_ID E/M/A/C/CAL/X/SS/D = TARGET_ID (Earth/Mars/Asteroid/Comet/Calibration/Checkout/Solar System/Dust) RPCIES = INSTRUMENT_ID x = {2,3,5} CODMAC data processing level numbers. phase = Mission phase abbreviation (GRND, LEOP, CVP, CR1, EAR1, etc) n.m = Version number Within each data set TARGET_NAME and TARGET_TYPE will then be used to identify the current target. (Thus they will not stay the same within one data set, but data set id will.) 3.1.3 Data Directory Naming Convention We intend to use a year/month/day directory hierarchy. The directory structure is covered in more detail in section 3.4.3. DATA_SET_ROOT | +----+---+-------+---. . . | | | DATA DOCUMENT CATALOG. . . | YYYY | | MM MM | | DD DD 3.1.4 Filenaming Convention For uncalibrated and calibrated data there will be two IES data files generated per mode per day. There will be one file for electron data and one file for ion data. The file names will follow the following naming convention: POSITION: 0123456789012345678.012 FILENAME: RPCIESYYMMDD_nnn_VV.EXT where: YY = Year MM = Month DD = Day nnn = ELC (electron) or ION (ion) VV = Archive product version EXT = LBL or TAB 3.2 Standards Used in Data Product Generation 3.2.1 PDS Standards IES complies to PDS version 3, and we use version 3.6 of the PDS standard reference. 3.2.2 Time Standards Time(UTC) in LBL files: yyyy-mm-ddThh:mm:ss.sss Time(UTC) in TAB files: yyyy-mm-ddThh:mm:ss.sss Spacecraft Clock (OBT) in LBL files: 1/nnnnnnnnnn Spacecraft Clock (OBT) in TAB files: nnnnnnnnnn 3.2.3 Reference Systems In order to determine IES pointing, attitude data for the Rosetta spacecraft is obtained through SPICE kernels and converted from the J2000 coordinate system to the HGRTN coordinate system. HGRTN is the heliocentric RTN system such that the sun-spacecraft vector defines the positive x-axis and the positive y-axis is the cross-product of the heliographic polar axis and the HGRTN positive x-axis. J2000 is the inertial frame defined by the intersection of the Earth mean equator and the ecliptic plane at the J2000 epoch of January 1, 2000 at noon. The pointing for each bin of IES is thereafter determined by multiplying the converted spacecraft attitude matrix in HGRTN by the vector representation of each particle measurement bin. The resulting vectors represent the flow of particles through the respective particle measurement bins in HGRTN coordinates. 3.3 Data Validation Data will be scanned for internal consistency when decommutating to edited raw format. Derived data will be compared to independent measurements by other instruments when possible. Before archiving a data set from some mission phase, this set will have been used internally by RPC scientists. It is planned to base all scientific analysis on the data products formatted. To actually have the data used by scientists before delivery to archive is considered the best way of revealing problems, and this is the approach taken by IES. After submission a PDS peer review will assess the data set and documentation for compliance and scientific usability. The peer review is typically done once for the initial submission and all subsequent submissions are merely checked for conformance to the standards put forth in this document. There will also be peer reviews from the Rosetta archive team as the data is made ready for ingestion into the PSA. 3.4 Content 3.4.1 Volume Set The IES archive will be submitted electronically, so there will initially be one volume for the entire dataset. PDS will create physical volumes for deep archiving. PSA requires no physical volumes, as the PSA is a completely online system. 3.4.2 Data Set Our naming convention for the data set will follow the same principles as the DATA_SET_ID thus. DATA_SET_NAME=ROSETTA-ORBITER E/M/A/C/CAL/X/SS/D RPCIES d PHASE Vm.n where: ROSETTA-ORBITER = INSTRUMENT_HOST_NAME E/M/A/C/CAL/X/SS/D = TARGET_NAME (EARTH MARS ASTEROID COMET CALIBRATION CHECKOUT SOLAR SYSTEM DUST) RPCIES = INSTRUMENT_ID d = CODMAC data processing level numbers 2,3 or 5. PHASE = Mission phase abbreviation (GRND, LEOP, CVP, CR1, EAR1, etc) Vm.n = Version number One data set will be used for each processing level. Multiple targets will be used for each data set and within each data set TARGET_ID will be used to identify the current target (Thus they will not stay the same within one data set, but data set id will). The data set name fits in the full length thus 60 characters. 3.4.3 Directories 3.4.3.1 Root Directory Table 2: Root Directory ContentsFile Name File Contents AAREADME.TXT This file completely describes the Volume organization and contents VOLDESC.CAT A description of the contents of this Volume in a PDS format readable by both humans and computers CATALOG/ Catalog directory DOCUMENT/ Document directory INDEX/ Index directory DATA/ Data directory BROWSE/ Browse directory EXTRAS/ Supplemental information directory 3.4.3.2 Catalog Directory Table 3: Catalog Directory Contents File Name File Contents CATINFO.TXT A description of the contents of this directory DATASET.CAT PDS Data Set catalog description of all the IES data files INSTHOST.CAT PDS instrument host (spacecraft) catalog description of the Rosetta orbiter spacecraft INST.CAT PDS instrument catalog description of the IES instrument MISSION.CAT PDS mission catalog description of the Rosetta mission PERSON.CAT PDS personnel catalog description of IES Team members and other persons involved with generation of IES Data Products REF.CAT IES-related references mentioned in other *.CAT files 3.4.3.3 Index Directory This directory contains the index files generated by the ESA S/W PVV. 3.4.3.4 Browse Directory and Browse Files Spectrograms or other browse products may be introduced at a later date. 3.4.3.5 Geometry Directory The geometry directory will contain any necessary instrument or frame kernels. 3.4.3.6 Document Directory Table 4: Document Directory ContentsFile Name File Contents DOCINFO.TXT A description of the contents of this directory and all subdirectories. IES_EAICD/ Directory containing the IES EAICD document IES_EAICD/IES_EAICD.DOC The IES Experiment-Archive Interface Control Document as a MS Word doc IES_EAICD/IES_EAICD.TXT The IES Experiment-Archive Interface Control Document in plain text IES_EAICD/IES_EAICD.LBL A PDF detached label that describes IES_EAICD.HTM, IES_EAICD.ASC, and IES_EAICD.PDF 3.4.3.7 Data Directory The data directory will contain .TAB files that have the archive data in fixed width, comma separated columns corresponding to PDS table objects. Accompanying each .TAB file will be a label file (.LBL) containing metadata about the archive. 4. DETAILED INTERFACE SPECIFICATIONS 4.1 Structure and Organization Overview See section 3.1.3 for general overview. Now as defined in section 3.1.3 we have the following structure for the DATA directory. DATA_SET_ROOT | +----+---+-------+---. . . | | | DATA | EDITED | YYYY | | MM MM | | DD DD 4.2 Data Sets, Definition and Content IES data is archived in PDS table objects. Each line represents a set of electron or ion counts for the azimuth bin groups at a given time, energy, and elevation. The following columns will be first in each archive file: Spacecraft Event Time (UTC) UTC time at the beginning of sample integration. UTC time is converted from the spacecraft clock time using the SPICE toolkit. Mode Instrument mode, which defines the structure of the energy-elevation-azimuth collapse for the counts. Energy Start Step Each electron or ion count occurs within a specified energy range. This is the number of the step that defines the start of the range of energy values. Energy Stop Step Each electron or ion count occurs within a specified energy range. This is the number of the step that defines the end of the range of energy values. Angle Start Step Each electron or ion count occurs within a specified elevation angle range. This is the number of the step that defines the start of the range of angle values. Angle Stop Step Each electron or ion count occurs within a specified elevation angle range. This is the number of the step that defines the end of the range of angle values. Following these columns is a series of azimuth columns. The value represents the number of electrons or ions observed in the azimuth bin (commonly referred to as counts) at the given time, energy, and elevation. These values are transmitted in groups of azimuth bins, which we expand by dividing the value by the number of azimuth bins in the group. 4.3 Data Product Design 4.3.1 Data Product Uncalibrated Design Example of edited raw data detached label file (e.g. RPCIES050329T_ELC_V2.LBL ): PDS_VERSION_ID = PDS3 DATA_SET_ID = "RO-E-RPCIES-2-EAR1-V2.0" DATA_SET_NAME = " ROSETTA-ORBITER EARTH RPCIES 2 EAR1 V2.0" STANDARD_DATA_PRODUCT_ID = "ELECTRON" PRODUCT_ID = "RPCIES050329_ELC_V2" PRODUCT_TYPE = "EDR" PROCESSING_LEVEL_ID = "2" PRODUCT_CREATION_TIME = 2007-08-10T18:20:29.345 PRODUCT_VERSION_ID = "2.0" LABEL_REVISION_NOTE = "RELEASE VERSION 2.0" RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 388 FILE_RECORDS = 22848 MD5_CHECKSUM = "ae03492f5152586086e3e795483f268b" START_TIME = 2005-03-29T09:54:42.000 STOP_TIME = 2005-03-29T14:06:26.000 SPACECRAFT_CLOCK_START_COUNT = "1/70710882" SPACECRAFT_CLOCK_STOP_COUNT = "1/70725986" MISSION_NAME = "INTERNATIONAL ROSETTA MISSION" MISSION_ID = "ROSETTA" MISSION_PHASE_NAME = "EARTH SWING-BY 1" TARGET_NAME = "EARTH" TARGET_TYPE = "PLANET" INSTRUMENT_HOST_NAME = "ROSETTA-ORBITER" INSTRUMENT_HOST_ID = "RO" INSTRUMENT_ID = "RPCIES" INSTRUMENT_NAME = " ROSETTA PLASMA CONSORTIUM - ION AND ELECTRON SENSOR" INSTRUMENT_TYPE = "PLASMA INSTRUMENT" COORDINATE_SYSTEM_ID = "N/A" COORDINATE_SYSTEM_NAME = "N/A" PRODUCER_ID = "RPC_IES_TEAM" PRODUCER_FULL_NAME = "BRAD TRANTHAM" PRODUCER_INSTITUTION_NAME = "SOUTHWEST RESEARCH INSTITUTE, SAN ANTONIO" DATA_QUALITY_ID = "N/A" DATA_QUALITY_DESC = "This archive contains raw uncalibrated data" SC_SUN_POSITION_VECTOR = " (1.0074628317975645, 0.1795336471864208, 0.09048890386861619)" NOTE = "Unit for SC_SUN_POSITION_VECTOR is AU" SC_TARGET_POSITION_VECTOR = " (0.020545226762147286, 0.04041582957112126, 0.030181810865584725)" NOTE = "Unit for SC_TARGET_POSITION_VECTOR is AU" SC_TARGET_VELOCITY_VECTOR = " (0.020545226762147286, 0.04041582957112126, 0.030181810865584725)" NOTE = "Unit for SC_TARGET_VELOCITY_VECTOR is km/s^2" SPACECRAFT_ALTITUDE = 8140864.60363458 NOTE = "Unit for SPACECRAFT_ALTITUDE is km" SUB_SPACECRAFT_LATITUDE = -33.48785968370159 SUB_SPACECRAFT_LONGITUDE = -92.46586575835545 DESCRIPTION = " This file contains IES raw electron sensor counts acquired during the Earth Swing-by 1 between 2005-03-29T09:54:42.000 and 2005-03-29T14:06:26.000." ^HEADER = ("RPCIES050329_ELC_V2.TAB", 1) ^TABLE = ("RPCIES050329_ELC_V2.TAB", 2) OBJECT = HEADER HEADER_TYPE = "SPREADSHEET" INTERCHANGE_FORMAT = ASCII BYTES = 388 DESCRIPTION = "Row of comma delimited, quoted column names" END_OBJECT = HEADER OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = 22848 COLUMNS = 23 ROW_BYTES = 388 OBJECT = COLUMN NAME = "SPACECRAFT EVENT TIME (UTC)" COLUMN_NUMBER = 1 DATA_TYPE = TIME START_BYTE = 1 BYTES = 23 DESCRIPTION = " This field contains the UTC time at the spacecraft at the beginning of the sample integration. This field has been generated from the spacecraft clock counter using the SPICE toolkit and appropriate leap seconds and spacecraft clock kernels. Time is provided in the standard PDS month/day format (i.e. 2005-03-05T00:00:00.215). All records from a single integration are assigned the same time. A complete integration requires the instrument to sweep through 16 azimuth directions for each of the 128 energy steps. Each azimuth step takes 1/16th of a second to complete, therefore a complete energy step requires 1.0 second and a complete integration requires 128.0 seconds." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "MODE" COLUMN_NUMBER = 2 START_BYTE = 25 BYTES = 11 DATA_TYPE = CHARACTER DESCRIPTION = " Instrument mode, which determines the values used for the energy and elevation steps." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ENERGY_START_STEP" COLUMN_NUMBER = 3 START_BYTE = 37 BYTES = 16 DATA_TYPE = ASCII_INTEGER FORMAT = "I3" DESCRIPTION = " The number of the energy step that starts this range" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ENERGY_STOP_STEP" COLUMN_NUMBER = 4 START_BYTE = 54 BYTES = 16 DATA_TYPE = ASCII_INTEGER FORMAT = "I3" DESCRIPTION = " The number of the energy step that ends this range" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ANGLE_START_STEP" COLUMN_NUMBER = 5 START_BYTE = 71 BYTES = 16 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION = " The number of the elevation step that starts this range" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "ANGLE_STOP_STEP" COLUMN_NUMBER = 6 START_BYTE = 88 BYTES = 16 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION = " The number of the elevation step that ends this range" END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 0 COUNTS" COLUMN_NUMBER = 7 START_BYTE = 105 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 0 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 1 COUNTS" COLUMN_NUMBER = 8 START_BYTE = 122 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 1 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 2 COUNTS" COLUMN_NUMBER = 9 START_BYTE = 139 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 2 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 3 COUNTS" COLUMN_NUMBER = 10 START_BYTE = 156 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 3 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 4 COUNTS" COLUMN_NUMBER = 11 START_BYTE = 173 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 4 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 5 COUNTS" COLUMN_NUMBER = 12 START_BYTE = 190 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 5 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 6 COUNTS" COLUMN_NUMBER = 13 START_BYTE = 207 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 6 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 7 COUNTS" COLUMN_NUMBER = 14 START_BYTE = 224 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 7 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 8 COUNTS" COLUMN_NUMBER = 15 START_BYTE = 241 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 8 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 9 COUNTS" COLUMN_NUMBER = 16 START_BYTE = 258 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 9 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 10 COUNTS" COLUMN_NUMBER = 17 START_BYTE = 275 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 10 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 11 COUNTS" COLUMN_NUMBER = 18 START_BYTE = 292 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 11 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 12 COUNTS" COLUMN_NUMBER = 19 START_BYTE = 309 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 12 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 13 COUNTS" COLUMN_NUMBER = 20 START_BYTE = 326 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 13 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 14 COUNTS" COLUMN_NUMBER = 21 START_BYTE = 343 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 14 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "AZIMUTH 15 COUNTS" COLUMN_NUMBER = 22 START_BYTE = 360 BYTES = 16 DATA_TYPE = ASCII_REAL FORMAT = "F9.4" DESCRIPTION = " This field contains electron counts observed in azimuth bin 15 divided by the size of the azimuth bin grouping. A fill value of -1 is used when data is not available for this bin." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "QUALITY FLAGS" COLUMN_NUMBER = 23 START_BYTE = 377 DATA_TYPE = CHARACTER BYTES = 9 DESCRIPTION = " These flags describe the quality of the data. The quality is coded in a 8 byte string. Each character can have the following values: VALUE: MEANING: x property described by flag is still unknown 0 no disturbance, good quality 1..9 specific disturbance/problems, see below Description of the specific flags: FLAG-STRING FLAG DESCRIPTION 87654321 ::::::::------ 1 OVERALL QUALITY: ::::::: x = overall quality not assessed ::::::: 0 = quality good without any processing ::::::: 1 = quality good after data processing ::::::: 2 = quality improved by data processing, still not good ::::::: 3 = data disturbed by unknown source ::::::: 4 = TBD ::::::: 5 = TBD ::::::: 6 = TBD ::::::: 7 = TBD ::::::: 8 = TBD ::::::: 9 = quality bad ::::::: :::::::------- 2 HIGH BACKGROUND PRESSURE :::::: x = impact not assessed :::::: 0 = no disturbance :::::: 1 = disturbance eliminated during data analysis :::::: 2 = data disturbed :::::: ::::::-------- 3 HIGH DUST FLUX ::::: x = disturbance not assessed ::::: 0 = no disturbance ::::: 1 = disturbance eliminated during data analysis ::::: 2 = data disturbed ::::: :::::--------- 4 TBD :::: x = no assessment :::: ::::---------- 5 TBD ::: x = no assessement ::: :::----------- 6 TBD :: x = no assessment :: ::------------ 7 TBD : x = no assessment : :------------- 8 TBD x = no assessment" END_OBJECT = COLUMN END_OBJECT = TABLE END