Spatial distributions of protons at high and low altitudes in the radiation belts - Comparison between theory and experiment

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Proton Density (Concentration), Radiation Belts, Satellite Observation, Spatial Distribution, Diffusion Coefficient, Drift, High Altitude, Low Altitude

Scientific paper

The paper presents a comparative analysis of experimental data on the spatial distribution of protons with energies above 0.1 MeV at high and low altitudes in the radiation belts as acquired by the Molniya-1, Cosmos-900, Elektron, and 1964-45A satellites. Experimental data for protons with energies above 0.2 MeV are then compared with theoretical calculations accounting for radial drift under the effect of electric and magnetic field fluctuations. It is shown that radial diffusion with a diffusion coefficient that is independent of geomagnetic latitude is the main mechanism for the formation of spatial distributions of protons up to a geomagnetic latitude of 40 deg.

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