Wave excitation downstream of the low-beta, quasi-perpendicular bow shock

Details Wave excitation downstream of the low-beta, quasi-perpendicular bow shock Wave excitation downstream of the low-beta, quasi-perpendicular bow shock

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6331b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6331-6335.

Physics

33

Electromagnetic Radiation, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Magnetosheath, Satellite Observation, Wave Excitation, Bow Waves, Electron Density (Concentration), Polarization (Waves), Shock Waves

Scientific paper

The low-frequency wave observations of the AMPTE/IRM mission in the downstream region of a marginally supercritical, quasi-perpendicular bow shock are interpreted. A simple model of the shocked plasma consisting of a background hydrogen magnetoplasma with anisotropic core protons permeated by a hotter dilute beam of anisotropic protons reproduces the basic features of the wave polarization and frequency spectra: wave activity below the proton cyclotron frequency, sometimes displaying a double-humped structure, with unusual dominance of left-hand-polarized modes. The core and beam anisotropies stimulate electromagnetic ion cyclotron waves in distinct spectral regions, whereas the large downstream Alfven speed precludes an efficient cyclotron resonant generation of the right-hand magnetosonic modes.

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