Data Set Information
DATA_SET_NAME PVO VENUS RETARD. POTENT. ANLYR. EDITED I/V CURVE (RDR) V1.0
DATA_SET_ID PVO-V-ORPA-2--IVCURVES-HIRES-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Dataset Overview ================ The Pioneer Venus Orbiter Retarding Potential Analyzer RDR data set is an essentially raw instrument data form which has been reformatted to facilitate analysis using a Least Squares Fit (LSF) technique for determining plasma parameters. The data set contains individual instrument 'sweeps' or Current/Voltage segments (I/V curves), packaged with instrument status information (mode, data quality, etc.) and spacecraft ephemeris data that has been extracted from the SEDR. The data set covers the entire range of orbital operations (orbits 1-5055) and spans the time period 1978-12-05 through 1992-10-07. Data Structure ============== Each orbit file consists of a file header table (one record) followed by groups of data (tables), each group representing a sweep. Each sweep section is furtherdivided into its header (one record table), a header for the data (one record table which tells how many records of data there will be), the data (table), the first and last data (two record table), a header for the SEDR data (one record table which tells how many records of SEDR data there will be), and the SEDR data (table). The PDS standards do not accomodate the labeling of variable record data structures. All ORPA-RDR data files are described by a detched 'minimum' PDS label ROW /____________________\ 1 | 40-byte File Header| ---------------------- /_____________________________________\ | | | ************************ | 2 | * 10-byte Sweep Header * | \ | ************************ | \ | | \ | ********************************** | \ | * 5-byte Data Header (NDP incl.) * | \ | ********************************** | \ | | \ | ******************** | \ . | * 47-byte Data * \ | \ | *------------------* NDP records | \ | *Currents/Voltages * / | this section | ******************** | is | | repeated for | ******************** | each sweep | * 47-byte 1st Data * | in the orbit | *------------------* | / | * 47-byte Last Data* | / | *------------------* | / | ******************** | / | | / | *********************************** | / | 3-byte SEDR Header (# roll periods) | / | *********************************** | / | | / | ********************** | / | * 184-byte SEDR Data * \ | / | *--------------------* NRP | | * .... * /records | | ********************** | EOF |_____________________________________| Ancillary Data ============== In each data directory, there are two additional files provided (RDR_DATA.IDX and SWEEP.IDX) which summarize the directory contents. The RDR_DATA.IDX file provides the number of sweeps, periapsis time, file records, start time, and stop times for each orbit. The SWEEP.IDX file provides detailed information including the number of records of data, number of peaks, number of SEDR records, plus start time and stop time for each sweep in each file.
DATA_SET_RELEASE_DATE 1993-06-30T00:00:00.000Z
START_TIME 1978-12-05T07:20:07.282Z
STOP_TIME 1992-10-07T08:11:23.083Z
MISSION_NAME PIONEER VENUS
MISSION_START_DATE 1968-06-01T12:00:00.000Z
MISSION_STOP_DATE 1992-10-07T12:00:00.000Z
TARGET_NAME VENUS
TARGET_TYPE PLANET
INSTRUMENT_HOST_ID PVO
INSTRUMENT_NAME ORBITER RETARDING POTENTIAL ANALYZER
INSTRUMENT_ID ORPA
INSTRUMENT_TYPE RETARDING POTENTIAL ANALYZER
NODE_NAME planetary plasma interactions
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE These data have not been processed in any way. The data are simply reformatted raw data, which have had some obviously bad sweeps removed (editted). These data are intended for use by ORPA investigators in their routine processing and analysis activities. Questions about the 'confidence' of these data must be addressed on a sweep-by-sweep basis.
CITATION_DESCRIPTION Goosby, J., PVO-V-ORPA-2--IVCURVES-HIRES-V1.0, PVO VENUS RETARD. POTENT. ANLYR. EDITED I/V CURVE (RDR) V1.0, NASA Planetary Data System, 1993.
ABSTRACT_TEXT The Pioneer Venus Orbiter Retarding Potential Analyzer RDR data set is an essentially raw instrument data form which has been reformatted to facilitate analysis using a Least Squares Fit (LSF) technique for determining plasma parameters. The data set contains individual instrument 'sweeps' or Current/Voltage segments (I/V curves), packaged with instrument status information (mode, data quality, etc.) and spacecraft ephemeris data that has been extracted from the SEDR. The data set covers the entire range of orbital operations (orbits 1-5055) and spans the time period 1978-12-05 through 1992-10-07.
PRODUCER_FULL_NAME JOE GOOSBY
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