On dipolarization and its relation to the substorm current wedge

Details On dipolarization and its relation to the substorm current wedge On dipolarization and its relation to the substorm current wedge

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9619417h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Nov. 1, 1991, p. 19,417-19,426. Research supported by DOE and NASA.

Physics

86

Field Aligned Currents, Geomagnetic Tail, Ionospheric Currents, Magnetic Field Reconnection, Magnetic Signatures, Magnetic Storms, Auroral Zones, Current Sheets, Wedges

Scientific paper

The near-earth properties of magnetospheric substorms are investigated using the Hesse and Birn (1991) self-consistent 3D MHD model of magnetotail activity. The simulation shows that an increase of Bz, a decrease of the cross-tail current, and an increase of region-1 field-aligned currents occurs roughly simultaneously, consistent with the empirical picture described by McPherron et al. (1973). It was also found that the region where the cross-tail current is reduced and diverted is located tailward from the dipolarization region. The results indicate that the apparent tailward propagation of the dipolarization effects does not support an earlier suggestion that the underlying process is initiated further earthward.

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