Bow-shock-associated proton heating in the upstream solar wind

Details Bow-shock-associated proton heating in the upstream solar wind Bow-shock-associated proton heating in the upstream solar wind

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2030a&link_type=abstract

Journal of Geophysical Research, vol. 81, May 1, 1976, p. 2030-2040. Bundesministerium für Forschung und Technologie

Physics

4

Bow Waves, Proton Energy, Shock Wave Attenuation, Solar Protons, Solar Wind, Anisotropic Media, Energy Transfer, Heos Satellites, High Temperature Plasmas, Magnetohydrodynamic Flow, Magnetohydrodynamic Waves, Proton Density (Concentration), Satellite Observation

Scientific paper

Solar-wind proton heating near the earth's bow shock is investigated theoretically and experimentally using data obtained by the Heos 2 satellite. Bow-shock-perturbation of the solar wind is discussed along with previous observations and theories of electron and proton heating in the bow-shock-perturbed region. Heos 2 data are then presented and analyzed which demonstrate that solar-wind protons in the bow-shock-perturbed upstream region are subject to collisionless heating by LF hydromagnetic waves that are characteristic of this region. It is concluded that: (1) the heating process will primarily affect the parallel temperature component, (2) the upstream hydromagnetic waves are locally excited by protons reflected from the bow shock, (3) the wave field extends relatively unattenuated to beyond about 20 earth radii of the bow shock, (4) both sufficient energy and sufficient time are available to heat protons in the shock-associated region, and (5) solar-wind measurements can be assumed to be completely uncontaminated by earth's proximity only when they are made well outside the shock-associated region and far away from the bow shock.

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