Features of polar cusp electron precipitation associated with a large magnetic storm

Computer Science

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Electron Precipitation, Magnetic Storms, Polar Regions, Field Aligned Currents, Magnetic Fields, Magnetic Measurement, Ogo-4, Satellite Observation

Scientific paper

Measurements of precipitating electrons made by the OGO-4 satellite reveal several interesting phenomena in the polar cusp. Extremely high fluxes of 0.7 keV electrons were observed in the polar cusp ninety minutes following the sudden commencement of a very large magnetic storm. Structured, fairly high fluxes of 7.3 keV electrons were also observed in the cusp region, accompanied by very strong search coil magnetometer fluctuations, indicative of strong field-aligned currents. The observations confirm previously reported latitudinal shifts in the location of the polar cusp in response to southward interplanetary magnetic fields.

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