Solar wind thermal electrons from 1.15 to 5.34 AU: Ulysses observations

J. L. Phillips, S. J. Bame, J. T. Gosling, D. J. McComas, B. E. Goldstein, A. Balogh

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13 Scopus citations


Using unique 3-d velocity space measurements by the Ulysses solar wind plasma experiment from 1.15 to 5.34 AU, we assess the radial gradient in thermal electron temperature. Until 3.8 AU, the gradient was steeper than previously reported but flatter than adiabatic; after 3.8 AU the gradient flattened. Trends in the observed electron distribution shapes qualitatively support predictions for regulation by Coulomb collisions and by expansion in a spiral IMF.

Original languageEnglish (US)
Pages (from-to)47-50
Number of pages4
JournalAdvances in Space Research
Issue number6
StatePublished - Jun 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • General Earth and Planetary Sciences


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