Observational evidence for a link between currents in the geotail and in the auroral ionosphere

Details Observational evidence for a link between currents in the geotail and in the auroral ionosphere Observational evidence for a link between currents in the geotail and in the auroral ionosphere

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988angeo...6..169l&link_type=abstract

Annales Geophysicae (ISSN 0980-8752), vol. 6, April 1988, p. 169-175. Research supported by DFG.

Computer Science

Sound

9

Auroral Electrojets, Geomagnetic Tail, Ionospheric Currents, Satellite Sounding, Ampte (Satellites), Geomagnetism, Magnetohydrodynamics

Scientific paper

On March 28, 1985 the AMPTE/IRM satellite observed at a distance of 14 earth radii close to local midnight quasi-periodic variations of the cross-tail current for about half an hour. For the period under study, IRM was magnetically conjugated to northern Scandinavia. Here, the same variations with an average period of 7 min have been monitored by the instruments of the EISCAT-Magnetometer Cross. Measurements by the EISCAT facility and ground magnetometers have been combined to determine the spatial and temporal variations of the auroral electrojets. A comparison of the ground observations with measurements made on the satellite shows that the cross-tail current was reduced whenever IRM was conjugated to an electrojet. It is quantitatively demonstrated that the current missing in the tail is by-passed through the ionosphere. The observations are not in accordance with a complete disruption of the tail current, but favor a local reduction of the cross-tail current density by some 30 percent.

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