Long-term variations of fast electrons in earth's outer radiation belt

Physics

Scientific paper

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Electron Flux Density, High Energy Electrons, Molniya Satellites, Outer Radiation Belt, Magnetospheric Instability, Proportional Counters, Solar Protons

Scientific paper

A number of Molniya satellites in earth's radiation belts measured integral particle fluxes by means of gas-proportional counters. Data obtained for inner and outer radiation-belt particles that penetrated a 0.7-g/sq cm shield and data on solar-flare protons are used to delineate variations in the intensity of electrons with energies of at least 5 MeV within the outer radiation belt. Three large increases in the intensity of these electrons are examined which were detected in a period of slightly more than two years. It is shown that these increases were followed by a slow exponential decay with a characteristic time of about 15 days and that the maxima were attained approximately 5 days after the onset of intense magnetospheric storms.

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