Electron-whistler interaction at the earth's bow shock. I - Whistler instability. II - Electron pitch angle diffusion

Details Electron-whistler interaction at the earth's bow shock. I - Whistler instability. II - Electron pitch angle diffusion Electron-whistler interaction at the earth's bow shock. I - Whistler instability. II - Electron pitch angle diffusion

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813325v&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,325-13,333, 13,335-13,346.

Physics

17

Bow Waves, Electron Diffusion, Shock Waves, Solar Terrestrial Interactions, Wave-Particle Interactions, Whistlers, Electron Distribution, Electrostatics, Magnetohydrodynamic Stability, Monte Carlo Method, Solar Wind

Scientific paper

Consideration is given to the interaction of whistler waves with the electrons in the earth's quasi-perpendicular bow shock of November 7, 1977. A Monte Carlo simulation which includes the effect of electrostatic noise is used to obtain the electron distribution function f(e) across the shock layer. Strong whistler emission from the electrons is found, with frequency and spatial dependencies of the growth rate in good agreement with the observed magnetic noise. It is concluded that in quasi-perpendicular collisionless shock, besides the reflected ion beam and the field-aligned electron beam, an important source of whistler mode waves is the electron loss cone due to reflection from the magnetic ramp. The shock steady electric field in the deHoffman-Teller frame energizes the electrons, but the parallel temperature is too high and the perpendicular temperature too low, and a hole in f(e) is formed. Parallel diffusion due to the electrostatic noise fills the hole in f(e) and creates a flat-topped distribution, thus cooling the electrons, but the perpendicular temperature remains too low.

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