Physics
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9010843a&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Nov. 1, 1985, p. 10,843-10,850.
Physics
5
Atmospheric Models, Birkeland Currents, Magnetospheric Instability, Plasma Dynamics, Space Plasmas, Ion Motion, Magnetohydrodynamic Flow, Plasma Layers, Polar Caps, Time Dependence
Scientific paper
A revised empirical model of the magnetosphere, based on observations of Birkeland currents, is presented with earthward flow in the plasma sheet confined to the duskside. Convection (E x B drift) carries tail-associated features in the sunward direction. This competes with Birkeland-current-associated plasma depletion (divergence of ion drifts), which allows flux tubes to collapse to a more dipolar form, thereby moving tail-associated features in the antisunward direction. In substorm intensifications, depletion dominates, and the taillike region recedes from the earth. The recession appears to be unstable. A quantitative relationship between Birkeland currents and convection is developed and is used on published results. It indicates that 4 x 10 to the 20th ions drift off a plasma sheet flux tube as it collapses from taillike to dipolar.
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