Abstract
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 language | English (US) |
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Pages (from-to) | 47-50 |
Number of pages | 4 |
Journal | Advances in Space Research |
Volume | 13 |
Issue number | 6 |
DOIs | |
State | Published - Jun 1993 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Aerospace Engineering
- Astronomy and Astrophysics
- Geophysics
- Atmospheric Science
- Space and Planetary Science
- General Earth and Planetary Sciences