Dataset description:

     This dataset contains the Supplemental Experimenter Data Records (SEDR)
     as provided by the Pioneer project to the Magnetometer team 
     (C.T. Russell - PI). The dataset covers the entire period of orbital
     operations, orbits 1-5055 (1978-12-05 to 1992-10-07). Each orbit was 
     originally provided on a separate IBM 9-track 800 bpi tape which contained
     6 files: 1) Standard Label file [sl] , 2) Ephemeris file [ep], 3) S/C
     Attitude file [at], 4) Pulse Time file [pt], 5) Selected Roll Reference 
     file [sr], 6) Spin period file [sp]. The original structure has been
     preserved within the limitations of the CD-ROM media, and the PDS data
     archive rules. The data remain in individual orbit files in IBM binary 
     and EBCDIC representations.

     One additional file has been provided by the UCLA Magnetometer team who
     have taken the primary responsibility for the SEDR archive. There is a
     "corrected pulse time file" which is identical to the original pulse
     time file in structure but which differs in content. The data in this file
     have been corrected using the OEFD phase information from the E5.4 khz
     channel. These data give a more accurate approximation of the actual 
     Sun pulse than is contained in the raw SEDR data. When there are no OEFD
     data available to make this correction, there is no corrected pulse time
     file. This situation occurs near solar conjunctions.

  Confidence Level Note:

     The original SEDR data have not been altered or corrected in any way 
     during the archive process. A "corrected pulse time" file has been
     included in this archive which was not a part of the original SEDR.

   Reference: 

     Ames Research Center
     Moffett Field, California
     PIONEER VENUS PROJECT
     SPECIFICATION PC-456.O4
     PIONEER VENUS:  DATA USER REQUIREMENTS
     FOR SUPPLEMENTARY EXPERIMENTER DATA RECORDS
     May 15, 1976