The ring current and particle precipitation near the plasmapause

Details The ring current and particle precipitation near the plasmapause The ring current and particle precipitation near the plasmapause

Mar 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ang....31..111h&link_type=abstract

(European Geophysical Society, Physics of the Plasmapause Symposium, 2nd, Trieste, Italy, Sept. 23-26, 1974.) Annales de Geophis

Physics

Magnetospheric Instability, Plasmapause, Proton Precipitation, Ring Currents, Angular Distribution, Auroras, Electron Precipitation, Energy Spectra, Magnetospheric Ion Density, Ogo-3, Satellite Observation

Scientific paper

Recent satellite observations of the precipitation of ring-current protons within and outside the plasmapause are reviewed with emphasis on the relations of these precipitated particles to the population in the equatorial plane and the processes which give rise to the precipitation. It is shown that strong pitch-angle diffusion of ring-current protons takes place outside the plasmasphere where, in a broad region, the magnetosphere is always in a turbulent state, and that the wave-particles interaction causing this strong diffusion is not the ion-cyclotron instability. Weak to moderate pitch-angle diffusion is found to occur at low latitudes (well inside the plasmapause) during quiet and moderately disturbed conditions and to be due to an ion-cyclotron instability requiring a relatively high density of cold ions to operate in the keV energy range. It is concluded that this low-latitude precipitation may be associated with SAR arcs and that these observations confirm the model for SAR arc production of Cornwall et al. (1971).

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