This data set contains wave electric field amplitudes measured
at four different frequencies by the Pioneer Venus Orbiter Electric
Field Detector.  The four frequencies are 100 Hz, 730 Hz, 5.4 kHz,
30 kHz.  The frequency filters are narrow-band, with a 30% bandwidth.
Thus wave intensities are given in V2/m2/Hz.  The filters are
continuously active, but data are only provided at a rate determined
by the spacecraft telemetry rate.  The wave antenna is oriented
perpendicular to the spacecraft spin axis, and so the wave instrument
measures only wave fields in the spacecraft spin plane.
Spin modulation of naturally occurring signals can be used to
obtain two dimensional wave field information.  The wave antenna
is a small Y-shaped structure, with effective separation of 0.76
meters. The spin phase of the effective dipole is included
within the high resolution data set for each of the channels, which
are sampled at different times.
  The Electric field data file contains the following information:

RECORD LENGTH  =    40
NUMBER OF COLUMNS =     9
OPERATING SYSTEM = SUN/UNIX
  # NAME      UNITS     SOURCE       DESCRIPTION
001 UT        SECONDS   PVO
002 E100HZ    (V/M)^2/H PVO EFD
003 E730HZ    (V/M)^2/H PVO EFD
004 E5.4KHZ   (V/M)^2/H PVO EFD
005 E30KHZ    (V/M)^2/H PVO EFD
006 E100 PH   DEG       PVO EFD PHASE
007 E730 PH   DEG       PVO EFD PHASE
008 E5.4K PH  DEG       PVO EFD PHASE
009 E30K PH   DEG       PVO EFD PHASE
MISSING DATA FLAG  =  1.000000E+32
AVERAGE INTERVAL   = HIGH RESOLUTION

  There is also a file available that contains ephemeris
data.  This is located in the directory /DATA/EPHEM and
has 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 productions are available.  A file
containing 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 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 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

The instrument noise level (and hence sensitivity) is determined
by the ambient environment at the time of observation.  Photo-
electrons emitted from various spacecraft surfaces appear to be
a strong source of electric field interference.  As a consequence
data acquired when the spacecraft is in sunlight often are contaminated
by spin modulated interference, especially when the spacecraft is
in the low density solar wind, where the Debye length is several
meters.  The noise is usually lowest when the antenna elements
are in the spacecraft shadow.  The noise level is also reduced
when the spacecraft is deep within the dayside ionosphere,
where the Debye length is much smaller than the antenna size.
The noise is not present when the spacecraft is within the
optical shadow of the planet.  In this case, however, additional
noise features are observed (mainly at 100 Hz) when the
spacecraft is at low altitude within the nightside ionosphere.  This
interference is readily discriminated in the high resolution data,
where the noise is present as a sharp pulse occurring twice per
spin.