Shock normal determination for multiple-ion shocks

Details Shock normal determination for multiple-ion shocks Shock normal determination for multiple-ion shocks

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9919359k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A10, p. 19,359-19,374

Physics

11

Halley'S Comet, Ions, Rankine-Hugoniot Relation, Shock Wave Propagation, Shock Waves, Solar Wind, Bow Waves, Ion Density (Concentration), Sun

Scientific paper

We have adapted the single-ion Vinas and Scudder (1986) solution to the Rankine-Hugoniot (R-H) problem to a multiple-on solution. Using this technique, we can calculate a shock normal direction, shock speed, best estimate of the upstream and downstream magnetic field and plasma asymptotic states, and thetaBn, the angle between the shock normal and the upstream magnetic field. We test the multi-ion solution with a theoretical case but are restricted to a perpendicular shock in order to close the multi-ion Rankine-Hugoniot equations. For this test case both single-ion and multi-ion solutions are equally valid. We examine parameter regimes to look for differences between single-ion and multi-ion solutions of the R-H equations, and we find that the largest differences occur for quasi-parallel shocks, small values of solar wind speed, large values of heavy ion density, and very strong and very weak shocks. For both the inbound and outbound crossing of comet Halley we have a slow solar wind speed, small values of water group ions and fairly weak shocks. We examine both the quasi-perpendicular inbound crossing and the quasi-parallel outbound crossing at comet Halley.

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