On rotational discontinuities in both two-fluid and hybrid models

Details On rotational discontinuities in both two-fluid and hybrid models On rotational discontinuities in both two-fluid and hybrid models

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.3755w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, March 1, 1991, p. 3755-3767.

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14

Elastic Waves, Magnetohydrodynamic Waves, Rankine-Hugoniot Relation, Rotating Plasmas, Shock Discontinuity, Magnetic Field Reconnection, Magnetopause, Time Dependence

Scientific paper

Rotational discontinuities are studied in a two-fluid model that includes finite ion inertia dispersion and in a hybrid model in which the full ion dynamics is retained while the electrons are treated as a massless fluid. It is shown that as in previous dissipative MHD studies, a rotational discontinuity is unstable in both models and evolves to a 2-3 intermediate shock, a slow rarefaction wave, and other waves. In addition, it is shown that the so-called Walen relation, which holds exactly for rotational discontinuities, can also be well satisfied by tran-Alfvenic intermediate shocks. Thus intermediate shocks can be candidates for those observed structures that satisfy the Walen relation.

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