Linear and nonlinear interactions of an electron beam with oblique whistler and electrostatic waves in the magnetosphere

Details Linear and nonlinear interactions of an electron beam with oblique whistler and electrostatic waves in the magnetosphere Linear and nonlinear interactions of an electron beam with oblique whistler and electrostatic waves in the magnetosphere

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9821353z&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 21,353-21,363

Physics

21

Beam Interactions, Earth Magnetosphere, Electron Beams, Electrostatic Waves, Plasma-Electromagnetic Interaction, Wave-Particle Interactions, Whistlers, Computerized Simulation, Wave Propagation

Scientific paper

Both linear and nonlinear interactions between oblique whistler, electrostatic, quasi-upper hybrid mode waves and an electron beam are studied by linear analyses and electromagnetic particle simulations. In addition to a background cold plasma, we assumed a hot electron beam drifting along a static magnetic field. Growth rates of the oblique whistler, oblique electrostatic, and quasi-upper hybrid instabilities were first calculated. We found that there are four kinds of unstable mode waves for parallel and oblique propagations. They are the electromagnetic whistler mode wave (WW1), the electrostatic whistler mode wave (WW2), the electrostatic mode wave (ESW), and the quasi-upper hybrid mode wave (UHW). A possible mechanism is proposed to explain the satellite observations of whistler mode chorus and accompanied electrostatic waves, whose amplitudes are sometimes modulated at the chorus frequency.

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