Implications of Ionospheric Substorm Electrodynamics Model

Details Implications of Ionospheric Substorm Electrodynamics Model Implications of Ionospheric Substorm Electrodynamics Model

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm12b..06h&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM12B-06

Other

2409 Current Systems (2708), 2704 Auroral Phenomena (2407), 2708 Current Systems (2409), 2712 Electric Fields (2411), 2788 Storms And Substorms

Scientific paper

A three dimensional current system model has been developed for the nighttime sector during the expansion phase through early recovery phase of bulge-type auroral substorms. This model was derived from height integrated horizontal ionospheric currents calculated from models of the height integrated conductivity and convection electric field models previously published. These models were based on a set of data from the Dynamics Explorer 2 satellite taken and organized on the basis of global auroral images from Dynamics Explorer 1. In contrast to a simple downward current post-midnight and upward current pre-midnight forming the substorm current wedge, we find the feeding as well as the drainage of the current wedge component of the westward electrojet is due principally to an imbalance of the downward region 0 and upward region 1 current sheets under which the electrojet is flowing. The total nightside westward electrojet has two maxima, one in the post-midnight bulge, most of which returns to the magnetosphere by midnight, the other in the surge. We have checked this configuration during other substorms using data from magnetometer chains and find generally a decrease in the electrojet intensity around midnight. We also trace the field-aligned current configuration into the magnetosphere to show where the various currents originate. Finally we find that the eastward electrojet originates entirely on the dayside and is drained entirely pre-midnight. It does not close into the westward electrojet due to the widening Harang region of low electric field that separates the electrojets.

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