Subcritical multiple-ion shocks

Details Subcritical multiple-ion shocks Subcritical multiple-ion shocks

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9613841m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Aug. 1, 1991, p. 13,841-13,848.

Physics

30

Halley'S Comet, Ionic Waves, Rankine-Hugoniot Relation, Shock Waves, Standing Waves, Heavy Ions, Mach Number, Magnetohydrodynamic Flow

Scientific paper

The influence of multiple ions on the structure of shock waves is examined theoretically for low Mach number situations. Hybrid simulations are employed to supplement the analytical investigation of multiple-ion Rankine-Hugoniot relations. This allows the derivation of tractable solutions for perpendicular shocks, which demonstrate that the behavior of light-ion components is different from that of heavy ones. Ion species separate into different regions in velocity space at the point of the shock, and although the ion velocity is the same for all species, the light-ion jump is stronger than that of the heavy ions. In the downstream region, the coupling of protons and heavy ions creates standing-ion hybrid waves. Near the shock, the bulk velocity difference generates ion-species gyration which is characterized by fixed phase relations in terms of the shock position, resulting in coherent downstream wave structures.

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