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This Pioneer Venus update file has been extracted from the old aaupdate.doc file at
the VMS anonymous FTP site for all COHO-related datasets. Directory names for
current Pioneer Venus data sets have been changed for new locations at this new
site. Note that all directory and file names at this site are actually in lower
case, even though they are given below in upper case.
                                                               2/24/99 JFC

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The complete ASCII data set for Pioneer Venus Orbiter data has been retrieved 
from the same Ames group site into PIONEER_VENUS/PLASMA/HOUR and covers 1978 
to 1992. This data set includes documentation, hour average solar wind 
parameters, and spacecraft orbital ephemeris data.
                                                            12/20/95 JFC

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NSSDC has received from the Planetary Data System a description in SFDU format
of Pioneer Venus Orbiter Plasma Analyzer (OPA) data which will shortly be
brought on-line by the PDS-PPI node and which will later be sent to NSSDC on
CD-ROM's. The data include high-resolution and hourly average measurements
for 1978 - 1992. The hourly average interplanetary data will be posted in COHO
after receipt by NSSDC. The PVO/OPA SFDU file is at [coho.sfdu]opa_pvo_final.sfd 
{old location} and was submitted to PDS by P. Gazis of NASA Ames Research Center.

                                                                JFC/09-19-94

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Although many users need heliographic spacecraft coordinates with latitudes
calculated with respect to the solar equator, some may not want Carrington
longitudes which are in a system fixed to the rotating Sun. Inertial
longitudes are defined with respect to the ascending node of the solar equator
on the Ecliptic; this node was at solar ecliptic longitude +74.367 degrees
as of 1 Jan. 1900 at 1200 UT and its longitude increases by 1.4 degrees per
century due to precession of the equinoxes in the solar ecliptic system. 

                                                                JFC/11-16-93

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  Solar wind plasma data from Pioneer Venus Orbiter for 1978-1992 are now in 
  directory PIONEER_VENUS/PLASMA.  
                                                    J. F. Cooper  12/23/92

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  Many new datasets have been recently loaded into COHO. These include 
  heliocentric coordinates from the [ACTIVE.HELIO]HELICOOR and PLANET programs 
  for Galileo/Cruise & Jupiter, ICE, IMP-8/Earth, PVO/Venus, Ulysses, and 
  Voyager 1/2. The first energetic particle data have been loaded into COHO 
  and were taken from newly archived data (submitted by Bruce Randall) of the 
  University of Iowa Geiger-Mueller Tube (GTT) experiment on Pioneer 10. 

  More data are coming by early 1993 from the Pioneer 10 and 11 GTT
  experiments, Pioneer Venus Orbiter plasma experiment, and other
  cosmic ray experiments on Pioneer 10 and 11. 
                                                  J. F. Cooper  12/8/92A

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  Telemetry with Pioneer Venus Orbiter was lost today. See PIONEER_VENUS/
  PVO_EOM.TXT for the NASA PAO announcement.  
                                                    J. F. Cooper  10/8/92

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  Venus has been added to program ANON_DIR:[ACTIVE.HELIO]PLANET which lists
  solar ecliptic and heliographic coordinates of several planets. This program
  can be executed remotely and writes output into the file planet.rp in the
  user's local root directory.
                                                    J. F. Cooper  10/7/92


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 The Pioneer Venus Orbiter (Pioneer 12) IMF data are now available for
 1979-1988 in PIONEER_VENUS/MAG. Magnetic field vectors and spacecraft position 
 are provided in Venus Solar Observer (VSO) coordinates, which are Venus-centered
 and aligned with the orbital plane of Venus. Data are provided only when PVO
 was in the interplanetary solar wind upstream of the ionospheric bow shock.
 See PVOMAG_FMT.txt for further details. 
                                                     J. F. Cooper 06/17/92   

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 PVO interplanetary IMF data for 1979-1988 have recently been acquired from UCLA
 and are now being processed for ingest into COHO. More recent PVO data for
 Oct 1990 to Dec 1991 has just been published as daily average tables in 
 Solar-Geophysical Data prompt reports, April, 1992, No. 572, Part I.

                                                     J. F. Cooper 05/28/92