Physics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9512057s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Aug. 1, 1990, p. 12057-12067.
Physics
11
Geomagnetic Tail, Ionospheric Currents, Magnetic Storms, Plasma Acceleration, Plasma Interactions, Current Sheets, Electrodynamics, Energetic Particles, Magnetohydrodynamic Waves, Polar Substorms
Scientific paper
The present one-dimensional model analysis of substorm electrodynamics proceeds from the standard scenario in which the plasma sheet collapses into a neutral sheet, and magnetic merging occurs between the two tail lobes; plasma flows into the neutral sheet from the lobes and the sides, undergoing acceleration in the dawn-dusk direction. The process is modified by the tendency of the accelerated plasma to unbalance charge neutrality, leading to an exchange of electrons with the ionosphere in order to maintain neutrality. The cross-tail current is weakened by the diversion: this reduces the adjacent lobe-field intensity, but without notable effects apart from a slight expansion of the tail boundary.
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