Energetic electron anisotropy and ELF waves onboard GEOS. How does quasi-linear diffusion work

Details Energetic electron anisotropy and ELF waves onboard GEOS. How does quasi-linear diffusion work Energetic electron anisotropy and ELF waves onboard GEOS. How does quasi-linear diffusion work

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.217..533s&link_type=abstract

In ESA Achievements of the Intern. Magnetospheric Study (IMS) p 533-537 (SEE N85-24544 14-46)

Physics

Anisotropy, Electron Diffusion, Extremely Low Frequencies, Geos 1 Satellite, Plasma Waves, Earth Magnetosphere, Electrons, Flux (Rate), Pitch (Inclination), Wave Generation

Scientific paper

Amplification of electromagnetic electron cyclotron waves (100 Hz to 3 kHz) in the magnetosphere when an anisotropic distribution of energetic electrons (10 keV to 200 keV) is present is considered. Measurements of the electron flux in energy and pitch-angle and of wave spectra obtained onboard GEOS-1 and 2 are examined. When an equilibrium situation with waves continuously emitted is established, the anisotropy (A) is frequency-dependent and tends towards the critical anisotropy (Ac) in the frequency range where pitch-angle diffusion acts. A model for the equilibrium differential flux of electrons in the presence of waves is established. It is demonstrated that waves are not emitted when A or = Ac or when the integrated growth rate along a given line of force is not large enough to maintain steady state.

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