Heating and cooling of protons in the fast solar wind between 0.3 and 1 AU: Helios revisited

Details Heating and cooling of protons in the fast solar wind between 0.3 and 1 AU: Helios revisited Heating and cooling of protons in the fast solar wind between 0.3 and 1 AU: Helios revisited

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11609105h&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A9, CiteID A09105

Physics

Plasma Physics

3

Interplanetary Physics: Solar Wind Plasma, Space Plasma Physics: Plasma Energization, Space Plasma Physics: Transport Processes

Scientific paper

The proton thermal energetics in the fast solar wind between 0.3 and 1 AU is reinvestigated using the Helios 1 and 2 data. Closer to the Sun, it is estimated that, to account for the observed radial profiles of the proton parallel and perpendicular temperature, nonnegligible parallel cooling and perpendicular heating are necessary. Around 1 AU heating is needed in both directions. We also calculate the corresponding rates and find that in total significant interplanetary heating is necessary, in agreement with previous results. The possible influence that deceleration of fast solar wind streams due to interaction with slow ones has on the proton thermodynamics is evaluated.

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