Formation of the large equatorial plasma depletions during superstorms by the ionosphere-thermosphere coupling effect

Details Formation of the large equatorial plasma depletions during superstorms by the ionosphere-thermosphere coupling effect Formation of the large equatorial plasma depletions during superstorms by the ionosphere-thermosphere coupling effect

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa23a..04k&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA23A-04

Physics

2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities

Scientific paper

We investigate the formation mechanism of the severe equatorial plasma depletions during the the large geomagnetic storms of July 15, 2000, March 31, 2001, October 29, 2003, and November 20, 2003. These phenomenon has been understood as produced by the perturbation electric fields. The characteristics of the large plasma depletions observed from DMSP F15 and ROCSAT-1 show the formation of steep walls and flat bottom, deepening and widening during the night, and co-locations with plasma bubbles. These observations demonstrate that the large equatorial plasma depletions are origined at the equatorial plasma bubbles. As a widening and deepening mechanism of the bubbles, we suggest the thermospheric compositon change. That is, the molecule-rich air produced by the heating of the polar atmosphere flows along plasma bubbles and additional plasma depletion inside bubbles can create the large depletions. This idea will be validated by presenting the observations and model simulations.

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