Low-Mach number quasi-parallel shocks - Upstream waves

Details Low-Mach number quasi-parallel shocks - Upstream waves Low-Mach number quasi-parallel shocks - Upstream waves

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9815275s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A9, p. 15,275-15,283.

Physics

5

Mach Number, Magnetic Effects, Shock Wave Interaction, Shock Wave Propagation, Whistlers, Magnetohydrodynamic Stability, Plasma-Particle Interactions, Two Dimensional Models

Scientific paper

A 2D hybrid code encompassing particle ions and massless fluid electrons is here used to investigate the structure of low Alfven Mach number (MA = 2.2) quasi-parallel shocks. Phase-standing dispersive whistler waves with upstream-directed group velocity are initially radiated by the shock ramp; the wave vector of these whistler waves is parallel to the average shock-normal direction. The steepness of the shock ramp varies along the shock surface, and leads to a modulation of the whistler wave amplitude at constant phase. Ions backstreaming from the shock into the upstream medium excite longer-wavelength whistler waves via EM ion/ion-beam instability.

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