HR: 17:00h
AN: SA34A-05    [Abstracts]
TI: Equatorial ionospheric disturbances during super storms seen from TIMED/GUVI, DMSP and ROCSAT-1
AU: * Kil, H
EM: hyosub.kil@jhuapl.edu
AF: JHU/APL, 11100 Johns Hopkins Road, Laurel, MD 21044 United States
AU: Paxton, L J
EM: larry.paxton@jhuapl.edu
AF: JHU/APL, 11100 Johns Hopkins Road, Laurel, MD 21044 United States
AU: Zhang, Y
EM: yongliang.zhang@jhuapl.edu
AF: JHU/APL, 11100 Johns Hopkins Road, Laurel, MD 21044 United States
AU: Su, S
EM: t2700146@ncu.edu.tw
AF: National Central University, National Central University, Chung-LI, 10000 Taiwan
AU: Oh, S
EM: oh@spweather.com
AF: Seoul National University, Seoul National Univeristy, Seoul, 10000 Korea, Republic of
AB: 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.
DE: 2415 Equatorial ionosphere
DE: 2427 Ionosphere/atmosphere interactions (0335)
DE: 2435 Ionospheric disturbances
DE: 2437 Ionospheric dynamics
DE: 2441 Ionospheric storms (7949)
SC: SPA-Aeronomy [SA]
MN: Fall Meeting 2005