Magnetospheric and ionospheric currents in the polar cusp and their dependence on the By component of the interplanetary magnetic field

Details Magnetospheric and ionospheric currents in the polar cusp and their dependence on the By component of the interplanetary magnetic field Magnetospheric and ionospheric currents in the polar cusp and their dependence on the By component of the interplanetary magnetic field

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.4167r&link_type=abstract

Journal of Geophysical Research, vol. 85, Aug. 1, 1980, p. 4167-4176. Research supported by the Natural Sciences and Engineerin

Physics

1

Auroral Electrojets, Earth Magnetosphere, Interplanetary Magnetic Fields, Ionospheric Currents, Polar Cusps, Polar Regions, Latitude, Magnetic Flux, Magnetic Signatures

Scientific paper

Previous studies of magnetic field perturbations at very high latitude have indicated the presence of an equivalent current system which is strongly modulated by the azimuthal (By) component of the interplanetary magnetic field. This current system is now thought to flow in the portion of the ionosphere to which the polar cusp (or cleft) maps. In this paper it is shown that, while the By component of the interplanetary magnetic field does not significantly change the total current flowing in the magnetosphere, it does redistribute the ionospheric portion of the current flow. This redistribution results in eastward ionospheric current being observed in the prenoon quadrant on the poleward side of the normally present westward electrojet when By is greater than 0, whereas only westward current flows in the prenoon quadrant when By is less than 0.

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