Cyclic behavior at quasi-parallel collisionless shocks

Details Cyclic behavior at quasi-parallel collisionless shocks Cyclic behavior at quasi-parallel collisionless shocks

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..345b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, May 1989, p. 345-348.

Astronomy and Astrophysics

Astrophysics

111

Astrophysics, Bow Waves, Periodic Variations, Shock Wave Propagation, Supersonic Flow, Convective Flow, Field Strength, Ion Motion, Magnetic Fields

Scientific paper

Large scale one-dimensional hybrid simulations with resistive electrons have been carried out of a quasi-parallel high-Mach-number collisionless shock. The shock initially appears stable, but then exhibits cyclic behavior. For the magnetic field, the cycle consists of a period when the transition from upstream to downstream is steep and well defined, followed by a period when the shock transition is extended and perturbed. This cyclic shock solution results from upstream perturbations caused by backstreaming gyrating ions convecting into the shock. The cyclic reformation of a sharp shock transition can allow ions, at one time upstream because of reflection or leakage, to contribute to the shock thermalization.

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