Survey of coherent ion reflection at the quasi-parallel bow shock

Details Survey of coherent ion reflection at the quasi-parallel bow shock Survey of coherent ion reflection at the quasi-parallel bow shock

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.2261o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, March 1, 1990, p. 2261-2271. Research sponsored by DOE.

Physics

33

Bow Waves, Ion Beams, Magnetic Fields, Shock Waves, Solar Terrestrial Interactions, Specular Reflection, Energy Dissipation, Ion Distribution, Ion Temperature, Solar Wind Velocity, Velocity Distribution

Scientific paper

This paper presents the results of a survey of ion beam observations near the earth's quasi-parallel bow shock. Particular attention is given to three issues: (1) the spatial locations of the cold coherent ion beams relative to the shock, (2) the velocity space locations of the ion beams relative to that expected for specular reflection, and (3) the parameter regimes over which the beams are observed. Evidence is found that coherent ion reflection occurs commonly in the quasi-parallel regime, over essentially the full range of upstream plasma parameters normally found at the earth's bow shock. It was also observed that the cold coherent reflected beams spread rapidly in the velocity space upstream from the shock. The observations presented serve as an extension to those presented by Gosling et al. (1989) and further strengthen the conclusion that specularly reflected ions are contributing directly to the downstream thermalization at the earth's quasi-parallel bow shock.

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