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NASA Space Science Data Coordinated Archive Header

Pioneer 11 Jovian Trapped Particle Interplanetary Data Summaries, ASCII


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1973-04-16 to 1977-05-31


This data set was created at the NSSDCA by converting the binary data set (SPHE-00223) to ASCII. The ASCII files contain the same content as the original binary files except that the block control bytes are removed and instead a record number is added as first column. In addition, two header records are added to the ASCII files: the first header record identifies the original binary Word number associated with a data column and the second header record names each column.

The original, experimenter-supplied, interplanetary summary data in SPHE-00223 are on binary magnetic tape created on a CDC 3600 computer. Each 300-word record contains one complete data summary (108 seconds), along with associated information including satellite number; mode of reduction (earth traversal, cruise, or Jupiter encounter); start and stop time of summary (in milliseconds); year and day of year; bit rates; and pulse, electrometer, and trajectory data. The ASCII files contain the same content.

The experimenter does not seem to have accounted for leap seconds when converting the elapsed time from the satellite into the Year and the Day of the Year (DOY) in data Words 5 and 6, respectively. During quality assurance, the NSSDCA found a slight discrepancy when comparing the Year and DOY recorded in the original data files with collection start and stop dates recorded in the metadata for SPHE-00223. The Year and DOY in the ASCII-converted data files also have the same discrepancy. In order to clarify the ambiguity in the recorded time information, the NSSDCA converted the given elapsed time (milliseconds since Jan 1, 1972; 1972-01-01T00:00:00) found in data Words 2 (ISTART) and 3 (ISTOP) into UTC with leap seconds accounted and provided them as separate ASCII files: DR000846_F00001.PHYS.timestamp.txt and DR000846_F00002.PHYS.timestamp.txt. The UTC format is YYYY-MM-DDTHH:MM:SS.sss.

Alternate Names

  • Interplanetary Data Summaries


  • Space Physics: Heliospheric Studies

Additional Information



Questions and comments about this data collection can be directed to: Dr. Young-In Won



NameRoleOriginal AffiliationE-mail
Dr. R. Walker FilliusData ProviderUniversity of California, San
Mr. Robert M. CandeyGeneral ContactNASA Goddard Space Flight
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