HR: 14:25h
AN: SA13B-04    [Abstracts]
TI: Disturbance Equatorial Electric Fields and Ionospheric Responses During Some Recent Intense Magnetic Storms
AU: * Abdu, M A
EM: maabdu@dae.inpe.br
AF: Instituto Nacional de Pesquisas Espaciais - INPE, Ave dos Astronautas 1758 Jd das Granjas, Sao Jose dos Campos, SP 12345-970 Brazil
AU: Batista, I S
EM: inez@dae.inpe.br
AF: Instituto Nacional de Pesquisas Espaciais - INPE, Ave dos Astronautas 1758 Jd das Granjas, Sao Jose dos Campos, SP 12345-970 Brazil
AU: Reinisch, B W
EM: Bodo_Reinisch@uml.edu
AF: Center for Atmospheric Research (ULCAR), Univerisity of Massachusetts, Lowell, Lowell, MA 01854 United States
AU: Sobral, J H
EM: sobral@dae.inpe.br
AF: Instituto Nacional de Pesquisas Espaciais - INPE, Ave dos Astronautas 1758 Jd das Granjas, Sao Jose dos Campos, SP 12345-970 Brazil
AU: Brum, C G
EM: christaino@dae.inpe.br
AF: Instituto Nacional de Pesquisas Espaciais - INPE, Ave dos Astronautas 1758 Jd das Granjas, Sao Jose dos Campos, SP 12345-970 Brazil
AB: Outstanding features of the equatorial disturbance electric fields during some intense magnetic storms that occurred in recent times (2003-05 period) are investigated using ground-based ionosonde and magnetometer data. During the October 2003 storm which was the most intense one, very strong prompt penetrating eastward electric field in the dusk sector caused giant plasma fountain with rapid uplift of the F layer base to very large heights (>1000 km, the usual operational height limit of the ionosonde) in the South American longitude sector, that resulted in the equatorial anomaly expansion towards middle latitude. In the midnight sector very intense westward electric field associated with the storm onset was responsible for the rapid downdraft of the F layer plasma that caused disruption of an ongoing plasma bubble/spread F development process. Results from longitudinally separated locations in South America reveal significant differences in the ionospheric response features that are longitude as well as local time dependent
DE: 2411 Electric fields (2712)
DE: 2415 Equatorial ionosphere
DE: 2435 Ionospheric disturbances
DE: 2439 Ionospheric irregularities
DE: 2441 Ionospheric storms (7949)
SC: SPA-Aeronomy [SA]
MN: Fall Meeting 2005