Physics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..119s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Feb. 1990, p. 119-122.
Physics
54
Collisionless Plasmas, Magnetohydrodynamic Turbulence, Shock Fronts, Whistlers, Magnetic Field Configurations, Magnetoacoustic Waves, Magnetoacoustics
Scientific paper
Large scale one-dimensional hybrid simulations have been performed of a quasi-parallel high Mach number collisionless shock. It is found that backstreaming reflected ions, i.e., upstream ions with velocities exceeding the shock ram velocity, originate from the outer part of the velocity space of the incident distribution. The backstreaming ions produce very low-frequency magnetosonic waves which propagate upstream with about 1.3 Alfven speed. As the wave crests convect toward the shock, they steepen up the shock reforms itself. During shock reformation a large part of the incident ions are reflected. This, in turn, slows the incident ions down. The slowed down incident particle distribution and the reflected particle distribution merge and constitute the new thermalized downstream distribution. In the interval of a relatively stationary shock low-frequency whistler waves stand at the shock front. During these time intervals, the whistler waves are probably responsible for dissipation by nonadiabatic compression of the incident ions.
Scholer Manfred
Terasawa Toshio
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