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.
Solar wind thermal electrons from 1.15 to 5.34 AU - Ulysses observations
Advances in Space Research ; 13 , 6
1993-06-01
Sonstige
Keine Angabe
Englisch
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