Interstellar pickup protons and solar wind heating in the outer heliosphere |
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| Authors: | S V Chalov D B Alexashov H J Fahr |
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| Institution: | (1) Institute for Problems in Mechanics, Russian Academy of Sciences, pr.Vernadskogo 101-1, Moscow, 119526, Russia;(2) Institute for Astrophysics and Extraterrestrial Research, Bonn University, Auf dem Hugel 71, Bonn, 53121, Germany |
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| Abstract: | The ionization of hydrogen atoms that penetrate into the heliosphere from the interstellar medium gives rise to a peculiar population of energetic protons (interstellar pickup protons) in the solar wind. The short-wavelength Alfvènic turbulence in the outer heliosphere is entirely attributable to the source associated with the instability of the initial anisotropic pickup proton velocity distribution. The bulk of the generated turbulent energy is subsequently absorbed by the pickup protons themselves through the cyclotron-resonance particle-wave interaction, and only an insignificant fraction of this energy can be transferred to the solar wind protons and heat them up. |
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