Excitation of electrostatic wave instability by dc electric field in earth's magnetoplasma

Details Excitation of electrostatic wave instability by dc electric field in earth's magnetoplasma Excitation of electrostatic wave instability by dc electric field in earth's magnetoplasma

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.3121m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A3, March 1, 1992, p. 3121-3128.

Physics

Collisionless Plasmas, Earth Magnetosphere, Electrostatic Waves, Magnetohydrodynamic Stability, Plasmas (Physics), Wave Propagation, Electron Cyclotron Heating, Harmonics, Plasma Density, Plasma Waves, Vlasov Equations

Scientific paper

The present study analytically derives the dispersion relation for electrostatic wave propagation in an anisotropic warm collisionless magnetoplasma, in the presence of a weak parallel (dc) electric field. An expression for the growth rate of the electrostatic wave and the marginal stability condition are obtained. The modifications introduced in the growth rate by the electric field and the temperature anisotropy are discussed using plasma parameters observed in the magnetospheric region. The effect of the electric field is to increase the growth rate of the electrostatic waves at different electron cyclotron harmonics, whereas the effect of the temperature anisotropy is to decrease the growth rate. The most unstable band of wave frequencies obtained with the aid of computations lies between 5 and 10 kHz. These wave frequencies are well within the experimentally observed frequencies of electrostatic emissions.

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