On the energy dependence of the ring current proton precipitation

Details On the energy dependence of the ring current proton precipitation On the energy dependence of the ring current proton precipitation

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..757s&link_type=abstract

Planetary and Space Science, vol. 25, Aug. 1977, p. 757-763.

Physics

2

Magnetospheric Proton Density, Proton Energy, Proton Precipitation, Ring Currents, Angular Distribution, Auroral Zones, Ion Cyclotron Radiation, Pitch (Inclination), Satellite Observation

Scientific paper

Low-altitude satellite measurements of protons in the 1-100-keV range indicate two energy-dependent proton-precipitation boundaries. At low invariant latitudes, mostly below 60 deg there is a region of moderately weak proton precipitation. The poleward boundary of this region tends to be at higher latitudes for the high-energy protons than for the low-energy protons. At high invariant latitudes there is a region where both the low- and high-energy protons precipitate with an isotropic pitch-angle distribution. The equatorward boundary of this region tends to be at lower latitudes for protons with energy more than 100 keV than for those in the 1-6-keV range. This region with isotropic pitch-angle distribution is located well outside the plasmapause for both the 1-6-keV and 100-keV protons. Between these two precipitation zones there is a region where the proton pitch-angle distribution is highly anisotropic with almost no protons in the loss cone. These findings lend further support to the mechanism of ion-cyclotron instability as the cause of proton pitch-angle diffusion in the low and intermediate regions.

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