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NASA Space Science Data Coordinated Archive Header

Mariner 2 Unaveraged Plasma Parameters, ASCII


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

Time span: 1962-08-29 to 1962-12-30


This data set, originally written in Binary (PSFP-00025), was converted to ASCII by NSSDC. The contents of file was unchanged with respect to original file except that the block control bytes were removed and the order of contents was slightly changed. The data consist of time, upper and lower limits of temperature, upper and lower limits of velocity, density of protons, ratio of alpha particle density to proton density, and a parameter that rates the validity of the model used in the analysis. The plasma parameters were derived by the experimenter from the reduced data on the basis of a convected isotropic Maxwell-Boltzmann velocity distribution. This assumption was applied to the proton portion of each spectrum and extended to the alpha particle portion by assuming either that proton and alpha particle temperatures or bulk speeds were equal. Before the conversion, the integer was represented by one bit of sign (positive: 0 negative:1) and 35 bits of magnitude. The float was represented by one sign bit, 8-bit exponent, and 27-bit fraction, with the exponent to the base of 2 and a bias of 128.


  • Space Physics: Magnetospheric Studies
  • Planetary Science: Fields and Particles

Additional Information



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



NameRoleOriginal AffiliationE-mail
Dr. Marcia M. NeugebauerData ProviderNASA Jet Propulsion
Dr. Marcia M. NeugebauerGeneral ContactNASA Jet Propulsion

Selected References

  • Neugebauer, M., and C. W. Snyder, Average properties of the solar wind as determined by Mariner 2, JPL, Calif. Inst. Technol., TR 32-991, Pasadena, CA, Nov. 1966.
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