Electron heating in quasi-perpendicular shocks - A Monte Carlo simulation

Details Electron heating in quasi-perpendicular shocks - A Monte Carlo simulation Electron heating in quasi-perpendicular shocks - A Monte Carlo simulation

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9514939v&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Sept. 1, 1990, p. 14939-14959.

Physics

36

Electron Cyclotron Heating, Monte Carlo Method, Shock Heating, Bow Waves, Electromagnetic Fields, Electron Distribution, Fokker-Planck Equation, Particle Interactions, Wave Interaction

Scientific paper

To study the problem of electron heating in quasi-perpendicular shocks, under the combined effects of 'reversible' motion, in the shock electric potential and magnetic field, and wave-particle interactions a diffusion equation was derived, in the drift (adiabatic) approximation and it was solved by using a Monte Carlo method. The results show that most of the observations can be explained within this framework. The simulation has also definitively shown that the electron parallel temperature is determined by the dc electromagnetic field and not by any wave particle induced heating. Wave-particle interactions are effective in smoothing out the large gradients in phase space produced by the 'reversible' motion of the electrons, thus producing a 'cooling' of the electrons. Some constraints on the wave-particle interaction process may be obtained from a detailed comparison between the simulation and observations. In particular, it appears that the adiabatic approximation must be violated in order to explain the observed evolution of the perpendicular temperature.

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