Alpha particles in field-aligned beams upstream of the bow shock - Simulations

Details Alpha particles in field-aligned beams upstream of the bow shock - Simulations Alpha particles in field-aligned beams upstream of the bow shock - Simulations

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..163b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Feb. 1989, p. 163-166.

Physics

18

Alpha Particles, Atmospheric Physics, Field Aligned Currents, Ion Beams, Self Consistent Fields, Shock Wave Propagation, Bow Waves, Helium Ions, Hydrogen Ions, Solar Wind, Supercritical Flow

Scientific paper

The possibility that field-aligned ion beams (FABs) formed by direct reflection could contain alpha particles is studied using self-consistent hybrid simulations of an oblique collisionless, supercritical shock. It is found that alpha particles can backstream from a shock in which the angle between the shock normal and the upstream magnetic field is 45 degrees. The deficit of alpha particles in the FABs, expressed as a relative density ratio to H(+) normalized to the solar wind He(2+) to H(+) density ratio, varies between about 0.1 and less than 0.01 and depends on the upstream H(+) and He(2+) temperatures.

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