Physics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18...57k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Jan. 1991, p. 57-60.
Physics
15
Field Aligned Currents, Magnetosphere-Ionosphere Coupling, Plasma Layers, Polar Substorms, Polarization (Charge Separation), Space Plasmas, Atmospheric Models, Geomagnetism, Ionospheric Currents, Ionospheric Disturbances, Magnetic Field Reconnection
Scientific paper
Depolarization observed in the near-earth plasma sheet can be initiated by the substorm expansion onset. Field-aligned currents at the substorm expansion onset are enhanced first in the ionosphere in response to an enhanced magnetospheric convection. Closure of substorm field-aligned currents through the plasma sheet can disrupt the cross-tail current to cause dipolarization in the plasma sheet. The electric field induced by the current disruption can launch a fast-mode compression wave to result in the plasma injection event. A new X line can form tailward of the dipolarization region during the substorm expansion phase. A timing sequence of substorm events is inferred from the proposed conceptual model of substorms based on the magnetosphere-ionosphere coupling process on the Alfven bounce time scale.
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