Possible applications of the slow nonpotential modes to the magnetosphere and consequences

Details Possible applications of the slow nonpotential modes to the magnetosphere and consequences Possible applications of the slow nonpotential modes to the magnetosphere and consequences

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1846s&link_type=abstract

Journal of Geophysical Research, vol. 82, May 1, 1977, p. 1846-1854.

Statistics

Applications

3

Earth Magnetosphere, Electromagnetic Wave Transmission, Plasma-Electromagnetic Interaction, Propagation Modes, Wave Dispersion, Gyrofrequency, Ion Cyclotron Radiation, Phase Velocity, Whistlers

Scientific paper

The general dispersion relation for slow waves propagating in plasmas of arbitrary beta is discussed in detail along with some possible applications to the magnetosphere. It is shown that the electromagnetic corrections to the quasi-steady approximation are important only at frequencies below the lower hybrid frequency when the parallel phase velocity is greater than the electron thermal speed. The properties of these slow waves and of fast electromagnetic waves are compared. Adopting an ordering scheme in the frequency range close to the ion gyrofrequency, it is shown that the perpendicular phase velocity of the fast electromagnetic waves should be at least one order of magnitude greater than the thermal velocity, which imposes very stringent propagation conditions on the properties of the whistler and ion-cyclotron waves close to the particle gyrofrequency. Applications to the magnetosphere are discussed. It is shown that it is almost impossible for the whistler mode or the electromagnetic ion-cyclotron mode to be amplified by instabilities associated with the high perpendicular thermal velocities characteristic of the magnetospheric plasma.

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