Propagation characteristics of waves upstream and downstream of quasi-parallel shocks

Details Propagation characteristics of waves upstream and downstream of quasi-parallel shocks Propagation characteristics of waves upstream and downstream of quasi-parallel shocks

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1007k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 11, p. 1007-1010.

Physics

13

Magnetohydrodynamic Waves, Shock Wave Propagation, Two Dimensional Models, Whistlers, Group Velocity, Ion Cyclotron Radiation, Upstream

Scientific paper

The propagation characteristics of waves upstream and downstream of quasi-parallel shocks are investigated by using 2D hybrid simulations. At low Alfven Mach numbers, M(A) below about 2, the shock is initially associated with upstream phase-standing whistlers. At later times, backstreaming ions excite longer-wavelength whistlers via the right-hand resonant ion/ion instability. These waves propagate along the magnetic field at a group velocity no smaller than the upstream flow speed, so that the waves remain in the upstream region. At higher MA (above about 3), these waves are convected back into the shock, causing its reformation and downstream perturbations. Shock transmitted waves mode-convert into Alfven/ion-cyclotron waves which have a wave vector along the shock normal (pointing upstream) and convect downstream. The 2D simulation results confirm our earlier suggestion that the upstream waves should be field aligned, and that their convection into the downstream is associated with linear mode conversion into the Alfven/ion-cyclotron branch.

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