Adiabatic-drift-loss modification of the electromagnetic loss-cone instability for anisotropic plasma

Details Adiabatic-drift-loss modification of the electromagnetic loss-cone instability for anisotropic plasma Adiabatic-drift-loss modification of the electromagnetic loss-cone instability for anisotropic plasma

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ap%26ss..72...97j&link_type=abstract

Astrophysics and Space Science, vol. 72, no. 1, Sept. 1980, p. 97-110.

Astronomy and Astrophysics

Astrophysics

1

Ion Cyclotron Radiation, Magnetospheric Instability, Plasma Drift, Plasma Waves, Satellite Observation, Whistlers, Adiabatic Conditions, Anisotropic Media, Energetic Particles, Plasma-Particle Interactions, Wave Dispersion

Scientific paper

Observation of the adiabatic behavior of energetic particle pitch-angle distributions in the magnetosphere in the past indicated the development of pronounced minima or drift-loss cones on the pitch-angle distributions centered at angles between particle velocity and magnetic field of approximately 90 deg in connection with storm-time changes in magnetospheric convection and magnetic field. Using a model of a drift-modified loss-cone distribution (MLCD) of the butterfly type, the linear stability of electromagnetic whistler or ion-cyclotron waves propagating parallel to the magnetic field has been investigated. The instability is shown to be quenched at high frequencies less than the marginally stable frequency, which is equal to A/(A + 1), where A is the thermal anisotropy. This quenching becomes stronger the higher are the respective parallel hot particle thermal velocity and cold plasma density. Particles around pitch-angles of approximately 90 deg are identified as generating electromagnetic cyclotron waves near the marginally stable frequency. It is concluded that the absence of electromagnetic VLF and ELF noise during times when MLCD develops is the result of the shift of the unstable spectrum to low frequencies.

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