Electric currents above Saint-Santin. III - A preliminary study of disturbances: June 6, 1978; March 22, 1979; March 23, 1979

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Ionospheric Currents, Ionospheric Disturbances, Magnetic Storms, Convection Currents, Diurnal Variations, Geomagnetism, Incoherent Scatter Radar, Interplanetary Magnetic Fields, Ionospheric Drift

Scientific paper

The disturbances in currents, drifts, and electric fields observed over Saint-Santin on selected days of geomagnetic storms are analyzed with a view to gaining a better understanding of the comparative roles of the underlying physical mechanisms. The following two mechanisms are shown to be of particular importance: (1) the penetration of convection electric fields from subauroral latitudes during periods of rapid change in the solar wind dynamo; and (2) changes in the global thermospheric circulation produced by storm-time Joule heating accompanied by changes in the action of the ionospheric wind dynamo.

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