Physics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..299o&link_type=abstract
Geopysical Research Letters (ISSN 0094-8276), vol. 22, no. 3, p. 299-302
Physics
5
Ion Cyclotron Radiation, Magnetoacoustic Waves, Magnetohydrodynamic Waves, Mathematical Models, Shock Waves, Space Plasmas, Two Dimensional Models, Wave Propagation, Computerized Simulation, Electrokinetics, Magnetohydrodynamic Stability
Scientific paper
The two-dimensional (2-D) structure of switch-off slow magnetosonic shocks is investigated using an electromagnetic hybrid (fluid electrons, kinetic ions) code. It is shown that the basic physical processes occurring at 1-D slow shocks are also operative in 2-D. Specifically, the interaction between the upstream ions and those streaming away from the shock results in the excitation of Alfven/ions-cyclotron (AIC) waves. Depending on the plasma parameters, these waves may either stay in the upstream or convect back into the shock resulting in a non-steady shock behavior which prevents the formation of a trailing wave train. Despite this similarity, some slow shocks which are steady in 1-D are found to be non-steady in 2-D. Fourier analysis of the waves downstream of non-steady shocks identifies them as AIC, demonstrating that the waves remain on the same branch as they convect from upstream into the downstream region.
Johnson Michael
Karimabadi Homa
Krauss-Varban Dietmar
Omidi Nojan
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