Computer Science
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15..319m&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 15, no. 8-9, p. 319-322
Computer Science
7
Ions, Magnetosheath, Plasma Waves, Protons, Shock Fronts, Shock Waves, Anisotropy, Convection, Electromagnetic Fields, Ionic Waves, Two Dimensional Models, Wave-Particle Interactions
Scientific paper
Distributions of ions heated in quasi-perpendicular bow shocks have large perpendicular temperature anisotropies that provide free energy for the growth of Alfven ion cyclotron (AIC) and mirror waves. These modes are often obsreved in the Earth's magnetosheath. Using two-dimensional hybrid simulations, we show that these waves are produced near the shock front and convected downstream rather than being produced locally downstream. The wave activity reduces the proton anisotropy to magnetosheath levels within a few tens of gyroradii of the shock but takes significantly longer to reduce the anisotropy of He(++) ions. The waves are primarily driven by proton anisotropy and the dynamics of the helium ions is controlled by the proton waves. Downstream of high Mach number shocks, mirror waves compete effectively with AIC waves. Downstream of low Mach number shocks, AIC waves dominate.
Karimabadi Homa
Krauss-Varban Dietmar
McKean Michael E.
Omidi Nojan
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