Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3211103n&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 11, CiteID L11103
Physics
2
Ionosphere: Auroral Ionosphere (2704), Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Substorms
Scientific paper
A simple equivalent circuit model is employed to examine the ionosphere-magnetotail coupling during substorms. The Pedersen and Hall conductivities are assumed to be finite in the two resistive regions, which represent the mid-tail plasma sheet and the poleward half of the nightside auroral oval. These two regions are connected through both the wedge-current and meridional-current systems. It is demonstrated that this model successfully reproduces substorm changes in the cross-tail current and the westward electrojet. In consistent with earlier observations, the solutions of the model suggest that about 90% of the westward electrojet is the Hall current. It is shown that at the expansion onset of substorms the overshoot electric field is induced more effectively for a weaker increase in the ionospheric conductivity.
Kamide Yohsuke
Nakai Hidekazu
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