Global dynamics of the magnetosphere for northward IMF conditions

Details Global dynamics of the magnetosphere for northward IMF conditions Global dynamics of the magnetosphere for northward IMF conditions

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52.1135t&link_type=abstract

(A91-27441 10-46) Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 52, Dec. 1990, p. 1135-1154.

Physics

21

Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Field Reconnection, Plasma Dynamics, Polar Caps, Auroras, Electric Fields, Field Aligned Currents, Particle Precipitation

Scientific paper

Ground-based and spacecraft observations of polar cap geophysical phenomena during periods of northward interplanetary magnetic field (IMF) show specific patterns of electric fields, field-aligned currents, aurora, and particle precipitation. These are basically different from those when the IMF is southward. The total combination of observational data for northward IMF indicates rather a closed magnetosphere. This topology has led to the formation of a specific convection pattern in the distant plasma sheet. As different theoretical studies show, the connection of the IMF to geomagnetic flux tubes poleward of the cusp region may serve as the driving mechanism for plasma sheet convection and as the dynamo of current systems.

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