Subcritical dispersive shock waves upstream of planetary bow shocks and at Comet Giacobini-Zinner

Details Subcritical dispersive shock waves upstream of planetary bow shocks and at Comet Giacobini-Zinner Subcritical dispersive shock waves upstream of planetary bow shocks and at Comet Giacobini-Zinner

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15.1303o&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Oct. 1988, p. 1303-1306.

Physics

26

Bow Waves, Giacobini-Zinner Comet, Planetary Waves, Shock Wave Propagation, Nonlinear Evolution Equations, Satellite Observation, Wave Packets

Scientific paper

The nonlinear evolution of ULF (magnetosonic) waves is studied using electromagnetic simulations. The waves were observed upstream of the planetary bow shocks at Comet Giacobini-Zinner. It is shown that as ULF waves generated by the resonant ion beam instability steepen, their polarization becomes linear. A high-frequency wave packet is generated by the steepening process. The steepened wave has a structure and a behavior similar to a subcritical dispersive shock. It is suggested that Comet Giacobini-Zinner did not have a single bow shock. It is concluded that the comet had a transition region consisting of a series of shocks which were convected by the solar wind.

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