Physics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.3541c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, April 1, 1985, p. 3541-3544. NSF-supported research.
Physics
11
Atmospheric Models, Auroras, Electric Fields, Ionospheric Currents, Polar Caps, Auroral Electrojets, Convection Currents, Earth Magnetosphere
Scientific paper
During periods of northward Bz, the electric field applied to the magnetosphere is generally opposite to that occurring during southward Bz and complicated patterns of convection result, showing some features reversed in comparison with the southward Bz case. A study is conducted of a simple generalization of early work on idealized convection models, which allows for coexistence of sunward convection over the central polar cap and antisunward convection elsewhere in the cap. The present model, valid for By approximately 0, has a four-cell convection pattern and is based on the combination of ionospheric current conservation with a relation between parallel auroral currents and parallel potential drops. Global magnetospheric issues involving, e.g., reconnection are not considered. The central result of this paper is an expression giving the parallel potential drop for polar cap auroras (with By approximately 0) in terms of the polar cap convection field profile.
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