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Pioneer 11 Solar Wind Plasma Data, Version 2.3 Hourly ASCII, Final


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

Time span: 1973-04-21 to 1992-05-30


This data collection consists of hourly resolution data in ASCII format from the Pioneer 11 Plasma Analyzer. 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 were created by averaging every valid parameter in each hour, regardless of the processing scheme used to derive it. Each plasma data file contains a header followed by data records. The filename format is p10_XX_YYh.asc where XX and YY are the start and end years of data in the file. Each data record contains the spacecraft ID (SCID), year, day of year, and time of day in hours, followed by the bulk velocity, number density, temperature, and where appropriate, the flow angles. Speeds are given in km/s, number densities are given in #/cc, temperatures are given in K, and flow angles are given in degrees. Prior to day Jan. 31, 1989, all directions are given in a spacecraft-centered ecliptic system, in which the E/W angle is positive in the direction of planetary rotation while a N/S angle of zero means that the solar wind flow is parallel to the plane of the ecliptic. After Jan. 31, 1989 the flow directions are given with respect to a RTN heliographic system for which the R component is radially outward from the Sun, T is in the direction of planetary orbital motion around the Sun, and N is orthogonal (RxT) to R and T.

This collection is available on-line at:

Alternate Names

  • P-11,Solar Wind,Ver 2.3 1-hr ASC


  • Space Physics: Heliospheric Studies


  • 73-019A-13M

Additional Information



Questions and 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, doi:10.1029/JA079i025p03489, 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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