Polar cap deflation during magnetospheric substorms

Details Polar cap deflation during magnetospheric substorms Polar cap deflation during magnetospheric substorms

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.3785m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, April 1, 1989, p. 3785-3789.

Physics

26

Dmsp Satellites, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Storms, Magnetospheric Instability, Polar Caps, All Sky Photography, Auroral Zones, Magnetic Field Reconnection

Scientific paper

The expanding/contracting polar cap model has been used to simulate DE-2 ion drift data during substorms as determined using the AL index. Of the 39 cases modeled, 57 percent required the opening of a nightside gap which maps to where reconnection occurs in the tail; 75 percent of the 16 recovery phase cases required a nightside gap, while only 29 percent of the 17 expansion phase cases required a nightside gap. On the basis of this result, it is concluded that if a nightside gap implies tail reconnection, then reconnection probably occurs after expansion phase onset and continues throughout most of the recovery phase of a substorm.

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