A Fresh Perspective of the Substorm Current System and Its Dynamo

Details A Fresh Perspective of the Substorm Current System and Its Dynamo A Fresh Perspective of the Substorm Current System and Its Dynamo

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm22d..03l&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM22D-03

Physics

7827 Kinetic And Mhd Theory, 7839 Nonlinear Phenomena, 7859 Transport Processes, 7863 Turbulence, 7871 Waves And Instabilities

Scientific paper

The common view for the substorm current system is a current wedge involving principally an azimuthal current system. We first evaluate briefly previous studies that provide strong evidence for the dominance of a meridional current system (MCS) in substorms. Based on these clues, we propose the dynamo for the MCS to be a kinetic current disruption process in the magnetotail such that dipolarization is achieved by magnetic field line slippage, thus producing the dynamo action of a tailward directed current with an earthward directed electric field. The total current strength is estimated to be about 10 MA for an average substorm size, consistent with that obtained from the KRM algorithm.

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