NSSDCA ID: PSFP-00478
Availability: Archived at NSSDC, accessible from elsewhere
Time span: 1978-12-05 to 1988-10-16
This description was generated automatically using input from the Planetary Data System.
This dataset contains vectors collected by the Pioneer Venus Orbiter (previously Pioneer 12) Magnetometer. The data are provided in spacecraft coordinates. In one format, apoapsis B, the magnetometer can be commanded to return 3 vectors per minor frame. In most others it transmits one vector per minor frame. In one format, periapsis E, it has no words in a minor frame. At very low sampling rates at which time the sine wave due to spacecraft spin could not be resolved. The magnetometer values are despun, and averaged on board using a Walsh transform (square wave) in phase and in quadiatune with the sun. The averaged despun magnetometer data could be sampled at the rate of once per spin, once every two spins or once every 4 spins. Each sample was an overlapped average of an interval twice as long as the interval sample period to avoid aliasing. Software is provided to which allows users to convert the magnetic field data from S/C coordinates to geophysical coordinates. The magnetic field file contains the following information: RECORD LENGTH = 56 NUMBER OF COLUMNS = 13 OPERATING SYSTEM = SUN/UNIX # NAME UNITS SOURCE DESCRIPTION 001 UT SECONDS PVO 002 BX SC NT PVO MAG B-field X direction 003 BY SC NT PVO MAG B-field Y direction 004 BZ SC NT PVO MAG B-field Z direction 005 BT NT PVO MAG B total 006 VARIANCE BX NT**2 PVO MAG Variance of BX 007 CVARIANCE BXY NT**2 PVO MAG Co-Variance of BXY 008 CVARIANCE BXZ NT**2 PVO MAG Co-Variance of BXZ 009 VARIANCE BY NT**2 PVO MAG Variance of BY 010 CVARIANCE BYZ NT**2 PVO MAG Co-Variance of BYZ 011 VARIANCE BZ NT**2 PVO MAG Variance of BZ 012 VARIANCE BT NT**2 PVO MAG Variance of BT 013 BN PVO MAG Number of Points MISSING DATA FLAG = 1.000000E+32 AVERAGE 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. The ephemeris file is located in the /DATA/EPHEM directory, and the file contains the following information: RECORD LENGTH = 64 NUMBER OF COLUMNS = 15 OPERATING SYSTEM = SUN/UNIX # NAME UNITS SOURCE DESCRIPTION 001 UTIME SECONDS PVO 002 X VSO RV PVO SEDR Position X 003 Y VSO RV PVO SEDR Position Y 004 Z VSO RV PVO SEDR Position Z 005 ALT KM PVO SEDR Altitude 006 SZA DEG PVO SEDR Solar Zenith Angle 007 PLONG DEG PVO SEDR Planetary longitude 008 PLAT DEG PVO SEDR Planetary latitude 009 SPX VSO PVO SEDR Spin axis X 010 SPY VSO PVO SEDR Spin axis Y 011 SPZ VSO PVO SEDR Spin axis Z 012 CLAT DEG PVO SEDR Celestial latitude 013 CLONG DEG PVO SEDR Celestial longitude 014 ELONG DEG PVO SEDR Earth celestial longitude 015 RSUN AU PVO SEDR Distance to the Sun MISSING DATA FLAG = 1.000000E+32 AVERAGE INTERVAL = 00:00:12.000 Other ancillary data products are available. A file containing engineering data is located in the directory /DATA/ENGR. It contains the following information: RECORD LENGTH = 64 NUMBER OF COLUMNS = 14 OPERATING SYSTEM = SUN/UNIX # NAME UNITS SOURCE DESCRIPTION 001 UT SECONDS PVO 002 ElecT DEG PVO MAG Electronics temperature 003 PsensT DEG PVO MAG P&T sensor temperature 004 GsensT DEG PVO MAG G sensor temperature 005 MODE 1:2:3 PVO MAG Fast Normal or Gradiometer 006 SMPLRATE 1 or 3 PVO MAG Sample format 007 CAL 0 or 1 PVO MAG Calibration 008 SAS 1:2:4 PVO MAG Spin average select 009 FORMAT 0-15 PVO EDR TLM data format 010 BITRAT BITS/S PVO EDR Bit rate 011 SPIN SECONDS PVO SEDR Spin period 012 TFS SECONDS PVO SEDR Pulse time 013 SMINR SECONDS PVO SEDR Sun-RIP difference 014 PTFLAG PVO SEDR Pulse Time flag MISSING 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 the directory /DATA/PHASEOFF. It contains the following information: RECORD LENGTH = 56 NUMBER OF COLUMNS = 13 OPERATING SYSTEM = SUN/UNIX # NAME UNITS SOURCE DESCRIPTION 001 UT SECONDS PVO 002 E100 PH DEG PVO EFD Modulation phase 003 E100 AMP V/M/HZ.5 PVO EFD Modulation amplitude 004 E730 PH DEG PVO EFD Modulation phase 005 E730 AMP V/M/HZ.5 PVO EFD Modulation amplitude 006 E5.4KPH DEG PVO EFD Modulation phase 007 E5.4KAMP V/M/HZ.5 PVO EFD Modulation amplitude 008 E30K PH DEG PVO EFD Modulation phase 009 E30K AMP V/M/HZ.5 PVO EFD Modulation amplitude 010 TAV NT PVO MAG Average T sensor offset 011 GDIFFX NT PVO MAG S/C field G correction X 012 GDIFFY NT PVO MAG S/C field G correction Y 013 GDIFFZ NT PVO MAG S/C field G correction Z MISSING DATA FLAG = 1.000000E+32 AVERAGE INTERVAL = 00:00:24.000 A file containing instrument status information is located in the directory /DATA/INSTSTAT. It contains the following information: RECORD LENGTH = 56 NUMBER OF COLUMNS = 13 OPERATING SYSTEM = SUN/UNIX # NAME UNITS SOURCE DESCRIPTION 001 UT SECONDS PVO 002 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 / S1xy 008 DPHS DEG PVO MAG Phase S2 - S1 009 DC1 NT PVO MAG DC of S1 010 DC2 NT PVO MAG DC of S2 011 ZCOS NT PVO MAG Cos amp of Z sens 012 ZSIN NT PVO MAG Sin amp of Z sens 013 ZDC NT PVO MAG DC amp of Z sens MISSING DATA FLAG = 1.000000E+32 AVERAGE INTERVAL = 00:00:24.000
These data are available on-line from the Planetary Data System (PDS) at:
https://pds-ppi.igpp.ucla.edu/data/PVO-V-OMAG-3--SCCOORDS-HIRES-V1.0/
Questions and comments about this data collection can be directed to: Dr. David R. Williams
Name | Role | Original Affiliation | |
---|---|---|---|
Dr. Christopher T. Russell | Data Provider | University of California, Los Angeles | ctrussell@igpp.ucla.edu |
Ms. Muriel Kniffin | General Contact | NASA Jet Propulsion Laboratory | muriel@igpp.ucla.edu |