Competing processes of electrostatic plasma waves excited by auroral electron beams - Comparison of EXOS D observation results with computer simulations

Details Competing processes of electrostatic plasma waves excited by auroral electron beams - Comparison of EXOS D observation results with computer simulations Competing processes of electrostatic plasma waves excited by auroral electron beams - Comparison of EXOS D observation results with computer simulations

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9815621w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A9, p. 15,621-15,630.

Physics

6

Auroras, Electron Beams, Particle Precipitation, Plasma Waves, Wave-Particle Interactions, Electron Cyclotron Heating, Electrostatics, Plasma Density, Whistlers

Scientific paper

In the regions of auroral particle precipitation the plasma wave phenomena detected by the EXOS D satellite show remarkable differences corresponding to the plasma condition and precipitating particle energy condition. In the region of the high plasma density where f(p) exceeds f(c), for the plasma frequency f(p) and the electron cyclotron frequency f(c), the upper hybrid waves are dominantly generated, while the quasi-electrostatic whistler mode waves are generated under the condition f(p) lower than f(c). By computer simulation, based on the electrostatic particle code, the competing processes between the quasi-electrostatic whistler mode wave and the upper hybrid waves are investigated for their growth; the results show that the generation of the electrostatic plasma waves are mainly controled by the plasma parameter f(p)/f(c) and that the upper hybrid waves become dominant only at less oblique wave normal angles when f(p) exceeds f(c). The simulation results then give interpretation for the evidences observed by the EXOS D satellite.

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