Heating and Cooling of Protons in the Fast Solar Wind Between 0.3 and 1 AU: Helios Reloaded

Details Heating and Cooling of Protons in the Fast Solar Wind Between 0.3 and 1 AU: Helios Reloaded Heating and Cooling of Protons in the Fast Solar Wind Between 0.3 and 1 AU: Helios Reloaded

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh44b..01h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH44B-01

Physics

Plasma Physics

[7846] Space Plasma Physics / Plasma Energization

Scientific paper

The proton thermal energetics in the fast solar wind between 0.3 and 1 AU is re-investigated 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, non-negligible 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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