Resonant geomagnetic field oscillations and Birkeland currents in the morning sector

Physics

Scientific paper

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Birkeland Currents, Earth Magnetosphere, Geomagnetic Pulsations, Geomagnetism, Ionospheric Currents, Ampte (Satellites), Electric Fields, Interplanetary Magnetic Fields, Morning, Thermal Plasmas

Scientific paper

The relationship between large-scale Birkeland currents and resonant oscillations of the geomagnetic field is investigated on the basis of Viking magnetic-field, electric-field, and particle measurements and AMPTE-CEE and IMP-8 magnetic-field measurements obtained during April 23-25, 1986. The data are presented in extensive graphs and characterized in detail. The 3-16-mHz 5-60-nT magnetic-field oscillations detected by Viking are also seen by AMPTE-CEE below L = 8.8 and extend from the lower L shells to the boundary between regions 1 and 2 of the Birkeland-current system, and this boundary is shown to be closely related to the interface between the low-latitude boundary layer and the central plasma sheet. It is suggested that the magnetospheric oscillations may be driven by several different solar-wind features, possibly depending on the direction of the IMF.

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