Solar Wind Heating Beyond 1 AU

Details Solar Wind Heating Beyond 1 AU Solar Wind Heating Beyond 1 AU

Oct 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973ap%26ss..24..335h&link_type=abstract

Astrophysics and Space Science, Volume 24, Issue 2, pp.335-347

Astronomy and Astrophysics

Astrophysics

18

Scientific paper

The effect of an interplanetary atomic hydrogen gas on solar wind proton, electron and α-particle temperatures beyond 1 AU is considered. It is shown that the proton temperature (and probably also the α-particle temperature) reaches a minimum between 2 AU and 4 AU, depending on values chosen for solar wind and interstellar gas parameters. Heating of the electron gas depends primarily on the thermal coupling of the protons and electrons. For strong coupling (when T p ≳T e ), the electron temperature reaches a minimum between 4 AU and 8 AU, but for weak coupling (Coulomb collisions only), the electron temperature continues to decrease throughout the inner solar system. A spacecraft travelling to Jupiter should be able to observe the heating effect of the solar wind-interplanetary hydrogen interaction, and from such observations it may be possible of infer some properties of the interstellar neutral gas.

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