A source of the backstreaming ion beams in the foreshock region

Details A source of the backstreaming ion beams in the foreshock region A source of the backstreaming ion beams in the foreshock region

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.3046t&link_type=abstract

Journal of Geophysical Research, vol. 88, Apr. 1, 1983, p. 3046-3054.

Physics

80

Bow Waves, Ion Beams, Magnetopause, Shock Waves, Solar Terrestrial Interactions, Solar Wind, Anisotropic Media, Earth Magnetosphere, Ion Cyclotron Radiation, Ion Distribution, Magnetic Field Configurations, Magnetosheath, Plasma Diagnostics

Scientific paper

The proposed source mechanism for the 'reflected' ion beams observed in the bow shock region's foreshock places the origin of the beams in the magnetosheath, downstream of the quasi-perpendicular shock portion whose transition is characterized by the downstream ion populations. Particle simulations indicate that highly anisotropic downstream ion distributions can excite electromagnetic ion cyclotron waves which, in turn, pitch angle-scatter the gyrating ions in a few ion gyroperiods. As a result, some ions acquire large parallel velocities and move fast enough along the convecting downstream magnetic field to escape back across the bow shock into the upstream region. The results presented are in general agreement with ISEE reflected ion observations.

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