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

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30ssc12l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 18, pp. SSC 12-1, CiteID 1958, DOI 10.1029/2003GL017835

Physics

16

Magnetospheric Physics: Current Systems (2409), Magnetospheric Physics: Electric Fields (2411), Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Storms And Substorms

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 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 ~10 MA for an average substorm size, consistent with that obtained from the KRM algorithm.

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