Equatorial ionospheric disturbances during super storms seen from TIMED/GUVI, DMSP and ROCSAT-1

Details Equatorial ionospheric disturbances during super storms seen from TIMED/GUVI, DMSP and ROCSAT-1 Equatorial ionospheric disturbances during super storms seen from TIMED/GUVI, DMSP and ROCSAT-1

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa34a..05k&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA34A-05

Physics

2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2441 Ionospheric Storms (7949)

Scientific paper

One of the most fascinating phenomena during super storms is the occurrence of severe equatorial plasma depletions in the equatorial region. While this phenomenon has been understood to be created by the transport of equatorial plasma by the storm-induced electric fields, we found several peculiarities of this phenomenon that cannot be explained by the currently known mechanisms. The simultaneous observations of the ionosphere from the DMSP and ROCSAT-1 satellites during the October 29-31, 2003 super storm demonstrate that this phenomenon is associated with plasma bubbles. The TIMED/GUVI 135.6-nm images on the nightside show the occurrence of emission-depleted dark bands in the regions where the severe equatorial plasma depletions occur. These observations strongly support the idea that the plasma bubbles are the origin of the severe plasma depletions. The question is how the bubbles deepen and widen during super storms. We investigate the source mechanism of the equatorial plasma depletions during super storms using the measurements of plasma density and thermospheric neutral composition.

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