Electrostatic waves in the earth's magnetotail and in comets, and electromagnetic instabilities in the magnetosphere and the solar wind

Details Electrostatic waves in the earth's magnetotail and in comets, and electromagnetic instabilities in the magnetosphere and the solar wind Electrostatic waves in the earth's magnetotail and in comets, and electromagnetic instabilities in the magnetosphere and the solar wind

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992itps...20..843g&link_type=abstract

IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. 20, no. 6, p. 843-866.

Computer Science

27

Comet Tails, Earth Magnetosphere, Electrostatic Waves, Geomagnetic Tail, Magnetohydrodynamic Stability, Solar Wind, Electromagnetic Noise, Ion Beams, Ion Cyclotron Radiation

Scientific paper

The paper discusses the role of electrostatic ion-beam instabilities in the generation of the broadband electrostatic noise in the earth's magnetotail and in electrostatic bursts in comets. The semicold approximation is used to review the theory of electromagnetic ion-cyclotron instabilities in multicomponent plasmas. The method is applied to ring current proton precipitation and to the generation of electromagnetic ion-cyclotron waves at the geostationary altitude. It is shown that due to the large proton thermal anisotropy observed in the core of the proton distribution function in the fast solar wind, strong electromagnetic ion-cyclotron waves can be generated. The waves can resonate with the alpha particles which, as a result of the resonant interaction, can be accelerated to velocities well in excess of the proton bulk velocity, provided that initially the alpha-proton drift velocity is larger than zero.

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