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NASA Space Science Data Coordinated Archive Header

Pioneer 10 Hourly Average Solar Wind Data, ASCII, from Version 3.1 Final Archive


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

Time span: 1972-04-18 to 1995-09-07


This data collection consists of hourly average data files for interplanetary solar wind from the Pioneer 10 Plasma Analyzer and converted to ASCII format from the original Version 3.1 final archive (NSSDC ID # 72-012A-13L) submitted to NSSDC in VMS binary format. The plasma bulk parameters (bulk velocity, proton number density, proton temperature, and flow angles) were obtained using one of three processing schemes described in the data set documentation. Hourly averaged data files with names p10plahr_YYYY.asc include one year of data (YYYY = 1972 to 1995) and were created by averaging every valid parameter in each hour, regardless of the processing scheme used to derive it. There are some hours late in the Pioneer 10 mission when density, temperature, or both were not available. Documentation for this and other Version 3.1 data sets are provided in SFDU format in ascii text file P10PLA_VOLDESC.SFDU, and the original format for the binary hourly data set is given in FORMATHR.SFDU. The FORTRAN source code PIOPLAHR.FOR from file PIOPLAHR.SFDU was used to convert the original binary files to ASCII format. The sequence of data fields in the ASCII version is the same as in the original binary format and each ASCII field is separated by one blank space. Data field names are listed at the top of each data column.

This collection is available on-line at:


  • NASA Space Science Data Coordinated Archive


  • Space Physics: Heliospheric Studies


  • 72-012A-13N

Additional Information



Questions or comments about this data collection can be directed to: Dr. John F. Cooper.



NameRoleOriginal AffiliationE-mail
Dr. Paul R. GazisGeneral ContactNASA Ames Research

Selected References

Wolfe, J. H., et al., Pioneer 10 observations of the solar wind interaction with Jupiter, J. Geophys. Res., 79, No. 25, 3489-3500, 1974.

Mckibbin, D. D., et al., Plasma Analyzer for the Pioneer Jupiter missions, Space Sci. Instrum., 3, 219-228, 1977.

Gosling, J. T., et al., A cookbook for determining essential transmission characteristics of spherical section electrostatic analyzers, Los Alamos Nat. Lab., LA-10147-M, 1984.

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