Physics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617715k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Oct. 1, 1991, p. 17,715-17,731.
Physics
32
Magnetoplasmadynamics, Shock Waves, Solar Wind, Space Plasmas, Bow Waves, Earth Magnetosphere, Mach Number, Satellite Observation
Scientific paper
The transition from steady low-Mach-number to unsteady high-Mach-number quasi-parallel shocks was investigated by performing large-scale 1D hybrid code simulations at increasing Mach numbers. It was found that only at very low Mach number shocks the steepening is limited by upstream phase-standing whistlers, as predicted by the classical theory (Tidman and Northrop, 1968). In the intermediate region of Mach numbers between 1.5 and 3.5, a very diverse behavior is observed. Backstreaming ions generate fast magnetosonic waves which dominate the upstream, with wavelengths longer than phase-standing whistlers. At increasing Mach numbers, the phase and group velocities of the dominant waves are reduced until they point back toward the shock; when there is sufficient energy flux in these waves, they lead to unsteady shock behavior and eventually to shock reformation.
Krauss-Varban Dietmar
Omidi Nojan
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