Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987angeo...5..133b&link_type=abstract
Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences (ISSN 0980-8752), vol. 5, June 1987, p. 133-145. Research su
Physics
11
Bow Waves, Ion Beams, Reflected Waves, Shock Wave Propagation, Space Plasmas, Incident Radiation, Particle Acceleration, Particle Trajectories, Self Consistent Fields, Solar Wind
Scientific paper
The formation of field-aligned ion beams at oblique collisionless shocks is examined using self-consistent hybrid simulations and test particle techniques. The properties of suprathermal ions and their distributions are described. The direct reflection of solar wind ions is proposed as the mechanism for field-aligned beams upstream of the earth's bow shock. The dependence of beam density and velocity on the shock parameters is investigated, and it is observed that the applicability of direct reflection depends on the sensitivity of the angle between the shock normal and the upstream magnetic field. The beam distribution functions are studied; a characteristic velocity anisotropy parallel and perpendicular to the magnetic field is detected, and it is determined that the distribution is not completely gyrotropic. The interaction between ion beams and shock drift acceleration is analyzed.
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