Distribution of escaping ions produced by non-specular reflection at the stationary quasi-perpendicular shock front

Details Distribution of escaping ions produced by non-specular reflection at the stationary quasi-perpendicular shock front Distribution of escaping ions produced by non-specular reflection at the stationary quasi-perpendicular shock front

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11305101g&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A5, CiteID A05101

Physics

Plasma Physics

5

Space Plasma Physics: Shock Waves (4455), Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Particle Acceleration, Interplanetary Physics: Planetary Bow Shocks, Interplanetary Physics: Interplanetary Shocks

Scientific paper

Field-aligned and gyrophase bunched ion beams are observed in the foreshock of the Earth bow shock. One of the mechanisms proposed for their production is non-specular reflection at the shock front. We study the distributions which are formed at the stationary quasi-perpendicular shock front within the same process which is responsible for the generation of reflected ions and transmitted gyrating ions. The test particle motion analysis in a model shock allows one to identify the parameters which control the efficiency of the process and the features of the escaping ion distribution. These parameters are: the angle between the shock normal and the upstream magnetic field, the ratio of the ion thermal velocity to the flow velocity upstream, and the cross-shock potential. A typical distribution of escaping ions exhibits a bimodal pitch angle distribution (in the plasma rest frame).

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