Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14r..45o&link_type=abstract
Advances in Space Research, Volume 14, Issue 7, p. 45-54.
Other
11
Bow Waves, Ion Sources, Magnetohydrodynamic Turbulence, Magnetohydrodynamic Waves, Magnetosheath, Shock Waves, Solar Wind, Anisotropy, Computerized Simulation, Geomagnetism, Ion Temperature, Plasma Diagnostics, Solar Planetary Interactions, Wave Generation
Scientific paper
In this paper the possible sources of waves and turbulence in the magnetosheath are discussed. In particular, three separate sources resulting in different types of waves are identified. One is the quasi-parallel portion of the bow shock which contains large amplitude magnetosonic waves generated at or upstream of the shock. Due to their small group velocity these waves are convected back into downstream. It is suggested that the convected wave energy results in the generation of Alfven waves through a linear mode conversion process. Another source is the quasi-perpendicular portion of the shock which results in an anisotropic plasma downstream of the shock. This temperature anisotropy is unstable to the excitation of both Alfven and mirror waves with the former having a larger growth rate. The competition between these two wave modes is discussed and it is shown that the mirror mode can be excited despite its lower growth rate. Finally, it is shown that the magnetopause itself can generate slow magnetosonic waves in the magnetosheath. It is suggested that these waves can be thought of as part of the overall magnetopause structure, as are dispersive whistlers associated with low Mach number shocks.
Krauss-Varban Dietmar
O'Farrell Anthony
Omidi Nojan
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