Simulation studies of plasma waves in the electron foreshock - The generation of downshifted oscillations

Details Simulation studies of plasma waves in the electron foreshock - The generation of downshifted oscillations Simulation studies of plasma waves in the electron foreshock - The generation of downshifted oscillations

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.8123d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 8123-8131. Research supported by USAF.

Physics

18

Electron Distribution, Plasma Oscillations, Plasma Waves, Shock Waves, Bow Waves, Electric Fields, Energy Spectra, Plasma Frequencies, Wave Generation, Wave Interaction

Scientific paper

The generation of waves with frequencies downshifted from the plasma frequency, as observed in the electron foreshock, is analyzed by particle simulation. Wave excitation differs fundamentally from the familiar excitation of the plasma eigenmodes by a gentle bump-on-tail electron distribution. Beam modes are destabilized by resonant interaction with bulk electrons, provided the beam velocity spread is very small. These modes are stabilized, starting with the higher frequencies, as the beam is broadened and slowed down by the interaction with the wave spectrum. Initially a very cold beam is also capable of exciting frequencies considerably above the plasma frequency, but such oscillations are quickly stabilized. Low-frequency modes persist for a long time, until the bump in the electron distribution is completely 'ironed' out. This diffusion process also is quite different from the familiar case of well-separated beam and bulk electrons. A quantitative analysis of these processes is carried out.

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