Data Set Information
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| DATA_SET_NAME |
PVO VENUS MAG RESAMPLED SC COORDS 24SEC AVGS V1.0
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| DATA_SET_ID |
PVO-V-OMAG-4--SCCOORDS-24SEC-V1.0
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| NSSDC_DATA_SET_ID |
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| DATA_SET_TERSE_DESCRIPTION |
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| DATA_SET_DESCRIPTION |
This dataset contains vectors collected by the Pioneer Venus Orbiter(previously Pioneer 12) Magnetometer which have been averaged over24 seconds on 12 second centers. The data are provided in spacecraftcoordinates whose system has it Z axis antiparallel to the spacecraftspin axis during orbit. This choice maintained the Z axisalong roughly the Earth's ecliptic north pole. Late in the missionwhen it was believed that the shadowing of the solar panels bythe booms was causing a problem, the spin axis was moved to thepole of the Venus orbital plane. The X-axis of the spacecraft coordinate system is toward the sunalong the projection of the Venus Sun line on the spacecraftequatorial (X-Y) plane. The Y axis is chosen to form a right handedorthogonal triad if the axis are selected in alphabetical order.Hence, the Y direction points roughly opposite to the direction ofVenus motion about the sun. Software is provided which allows usersto convert the magnetic field data from S/C coordinates to geophysicalcoordinates. The magnetic field file contains the following information:RECORD LENGTH = 56NUMBER OF COLUMNS = 13OPERATING SYSTEM = SUN/UNIX # NAME UNITS SOURCE DESCRIPTION001 UT SECONDS PVO002 BX S/C coords. NT PVO MAG B-field X direction003 BY S/C coords. NT PVO MAG B-field Y direction004 BZ S/C coords. NT PVO MAG B-field Z direction005 BT NT PVO MAG B total006 VARIANCE BX NT**2 PVO MAG Variance of BX007 CVARIANCE BXY NT**2 PVO MAG Co-Variance of BXY008 CVARIANCE BXZ NT**2 PVO MAG Co-Variance of BXZ009 VARIANCE BY NT**2 PVO MAG Variance of BY010 CVARIANCE BYZ NT**2 PVO MAG Co-Variance of BYZ011 VARIANCE BZ NT**2 PVO MAG Variance of BZ012 VARIANCE BT NT**2 PVO MAG Variance of BT013 BN PVO MAG Number of PointsMISSING DATA FLAG = 1.000000E+32AVERAGE INTERVAL = 00:00:24.000 The program PVROT will rotate the data into Venus Solar orbital(VSO)coordinates using the magnetic field file and the ephemeris file. Theephemeris file is located in the /DATA/EPHEM directory, and hasthe following information:RECORD LENGTH = 64NUMBER OF COLUMNS = 15OPERATING SYSTEM = SUN/UNIX # NAME UNITS SOURCE DESCRIPTION001 UT SECONDS PVO002 X VSO RV PVO SEDR Position X003 Y VSO RV PVO SEDR Position Y004 Z VSO RV PVO SEDR Position Z005 ALT KM PVO SEDR Altitude006 SZA DEG PVO SEDR Solar Zenith Angle007 PLONG DEG PVO SEDR Planetary longitude008 PLAT DEG PVO SEDR Planetary latitude009 SPX VSO PVO SEDR Spin axis X010 SPY VSO PVO SEDR Spin axis Y011 SPZ VSO PVO SEDR Spin axis Z012 CLAT DEG PVO SEDR Celestial latitude013 CLONG DEG PVO SEDR Celestial longitude014 ELONG DEG PVO SEDR Earth celestial longitude015 RSUN AU PVO SEDR Distance to the SunMISSING DATA FLAG = 1.000000E+3AVERAGE INTERVAL = 00:00:12.000 Other ancillary data products are available. A file containsengineering data is located in the directory /DATA ENGR. Itcontains the following information:RECORD LENGTH = 64NUMBER OF COLUMNS = 14OPERATING SYSTEM = SUN/UNIX # NAME UNITS SOURCE DESCRIPTION001 UT SECONDS PVO002 ElecT DEG PVO MAG Electronics temperature003 PsensT DEG PVO MAG P&T sensor temperature004 GsensT DEG PVO MAG G sensor temperature005 MODE 1:2:3 PVO MAG Fast Normal or Gradiometer006 SMPLRATE 1 or 3 PVO MAG Sample format007 CAL 0 or 1 PVO MAG Calibration008 SAS 1:2:4 PVO MAG Spin average select009 FORMAT 0-15 PVO EDR TLM data format010 BITRAT BITS/S PVO EDR Bit rate011 SPIN SECONDS PVO SEDR Spin period012 TFS SECONDS PVO SEDR Pulse time013 SMINR SECONDS PVO SEDR Sun-RIP difference014 PTFLAG PVO SEDR Pulse Time flagMISSING DATA FLAG = 1.000000E+32 FORMAT: 0:ENG,1:UNK,2:UNK,3:PGM,4:ACS,5:CMRO,6:PYBK,7:DMRO,8:LACR, 9:PERA,10:PERB,11:PERC,12:PERD,13:PERE,14:APOA,15:APOB A file containing the phase and offset data is located in thedirectory /DATA/PHASEOFF. It contains the following information:RECORD LENGTH = 56NUMBER OF COLUMNS = 13OPERATING SYSTEM = SUN/UNIX # NAME UNITS SOURCE001 UT SECONDS PVO002 E100 PH DEG PVO EFD Modulation phase003 E100 AMP V/M/HZ.5 PVO EFD Modulation amplitude004 E730 PH DEG PVO EFD Modulation phase005 E730 AMP V/M/HZ.5 PVO EFD Modulation amplitude006 E5.4KPH DEG PVO EFD Modulation phase007 E5.4KAMP V/M/HZ.5 PVO EFD Modulation amplitude008 E30K PH DEG PVO EFD Modulation phase009 E30K AMP V/M/HZ.5 PVO EFD Modulation amplitude010 TAV NT PVO MAG Average T sensor offset011 GDIFFX NT PVO MAG S/C field G correction X012 GDIFFY NT PVO MAG S/C field G correction Y013 GDIFFZ NT PVO MAG S/C field G correction ZMISSING DATA FLAG = 1.000000E+32AVERAGE INTERVAL = 00:00:24.000In the directory /DATA/INSTSTAT is a file that contains information ofinterest to the engineer. It includes instrument statusinformation. We've included this file since it is part of ourstandard products. It contains the following information:RECORD LENGTH = 56NUMBER OF COLUMNS = 13OPERATING SYSTEM = SUN/UNIX # NAME UNITS SOURCE DESCRIPTION001 UT SECONDS PVO002 PCOS NT PVO MAG Norm(P cos amp)003 PSIN NT PVO MAG Norm(P sin amp)004 DX NT PVO MAG Norm(Tsin-Gcos)005 DY NT PVO MAG Norm(Gsin+Tcos)006 DZ NT PVO MAG Norm(Gdc-Pdc)007 RAMP PVO MAG S2xy / S1xy008 DPHS DEG PVO MAG Phase S2 - S1009 DC1 NT PVO MAG DC of S1010 DC2 NT PVO MAG DC of S2011 ZCOS NT PVO MAG Cos amp of Z sens012 ZSIN NT PVO MAG Sin amp of Z sens013 ZDC NT PVO MAG DC amp of Z sensMISSING DATA FLAG = 1.000000E+32AVERAGE INTERVAL = 00:00:24.000
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| DATA_SET_RELEASE_DATE |
1993-06-30T00:00:00.000Z
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| START_TIME |
1978-12-05T07:20:07.282Z
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| STOP_TIME |
1988-10-16T06:19:10.425Z
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| MISSION_NAME |
PIONEER VENUS
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| MISSION_START_DATE |
1968-06-01T12:00:00.000Z
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| MISSION_STOP_DATE |
1992-10-07T12:00:00.000Z
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| TARGET_NAME |
VENUS
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| TARGET_TYPE |
PLANET
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| INSTRUMENT_HOST_ID |
PVO
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| INSTRUMENT_NAME |
FLUXGATE MAGNETOMETER
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| INSTRUMENT_ID |
OMAG
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| INSTRUMENT_TYPE |
MAGNETOMETER
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| NODE_NAME |
planetary plasma interactions
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| ARCHIVE_STATUS |
ARCHIVED
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| CONFIDENCE_LEVEL_NOTE |
These data have been reprocessed several times during the courseof the mission. Each successive reprocessing has eliminated someof the problems found in earlier version of the data. Please bringto the attention of the original investigator any suspicious sectionof data. No zero level correction has been applied to the data becauseof the small size of the determined zero level.
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| CITATION_DESCRIPTION |
Kniffin, M., PVO-V-OMAG-4--SCCOORDS-24SEC-V1.0, PVO VENUS MAG RESAMPLED SC COORDS 24SEC AVGS V1.0, NASA Planetary Data System, 1993.
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| ABSTRACT_TEXT |
This dataset contains vectors collectedby the Pioneer Venus Orbiter (previously Pioneer 12) Magnetometer which havebeen averaged over 24 seconds on 12 second centers. The data are provided inspacecraft coordinates whose system has it Z axis antiparallel to thespacecraft spin axis during orbit. This choice maintained the Z axisalong roughly the Earth's ecliptic north pole. Late in the missionwhen it was believed that the shadowing of the solar panels bythe booms was causing a problem, the spin axis was moved to thepole of the Venus orbital plane.
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| PRODUCER_FULL_NAME |
MURIEL KNIFFIN
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| SEARCH/ACCESS DATA |
Planetary Plasma Interactions Website
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