Convection electric field effects on outer radiation belt electron precipitation

Details Convection electric field effects on outer radiation belt electron precipitation Convection electric field effects on outer radiation belt electron precipitation

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34..271g&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 34, March 1986, p. 271-277.

Computer Science

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Diurnal Variations, Electric Fields, Electron Precipitation, High Energy Electrons, Magnetospheric Electron Density, Outer Radiation Belt, Electron Diffusion, Electron Flux Density, Electron Trajectories, Plasma Drift

Scientific paper

A model is presented for the possible diurnal modulation of outer radiation belt electron precipitation by considering the effect of the convection electric field on geomagnetically trapped electrons. The modulation flux is the flux due to electrons in the drift loss cone, i.e., those which drift into the bounce loss cone. The electron flux in the drift loss cone is related to the time allowable for diffusion from the stably trapped population to the drift loss cone for precipitation at a specific geographic location. This time, which is termed the maximum L-shell lifetime, is obtained by computing electron trajectories, using a realistic magnetic field model and a simple model for the electric field. The maximum L-shell lifetimes are taken to be the times between successive entries into the bounce loss cone. Conservation of the first two adiabatic invariants, as electrons are slowly energized by the convection electric field, leads to variations in pitch angle, maximum L-shell lifetimes, and, consequently, to changes in the electron flux in the drift loss cone. These results are compared with observations of precipitating electrons made with sounding rocket payloads.

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