HR: 17:05h
AN: SH52B-05    [PDF]
TI: Conjugate Point Equatorial Experiments in Brazil: Preliminary results on Space Weather Related Variabilities in Spread F and Ionization Anomaly.
AU: * Abdu, M A
EM: abdu@dae.inpe.br
AF: Instituto Nacional de Pesquisas Espaciais - INPE, Ave dos Astronautas 1758,, Sao Jose dos Campos, SP 12245 970 Brazil
AU: Batista, I S
EM: inez@dae.inpe.br
AF: Instituto Nacional de Pesquisas Espaciais - INPE, Ave dos Astronautas 1758,, Sao Jose dos Campos, SP 12245 970 Brazil
AU: Reinisch, B W
EM: bodo_reinisch@uml.edu
AF: Center for Atmospheric Research, University of Massachusetts, Lowell, MA 01854 United States
AU: Souza, J R
AF: Instituto Nacional de Pesquisas Espaciais - INPE, Ave dos Astronautas 1758,, Sao Jose dos Campos, SP 12245 970 Brazil
AU: Sobral, J H
AF: Instituto Nacional de Pesquisas Espaciais - INPE, Ave dos Astronautas 1758,, Sao Jose dos Campos, SP 12245 970 Brazil
AU: Paula, E R
EM: eurico@dae.inpe.br
AF: Instituto Nacional de Pesquisas Espaciais - INPE, Ave dos Astronautas 1758,, Sao Jose dos Campos, SP 12245 970 Brazil
AU: Bulett, T W
AF: Air Force Research Laboratory, Hanscom AFB, Bedford, MA 01860 United States
AU: Schuch, N J
EM: njschuch@lacesm.ufsm.br
AF: Instituto Nacional de Pesquisas Espaciais - INPE, Ave dos Astronautas 1758,, Sao Jose dos Campos, SP 12245 970 Brazil
AB: We will present some preliminary results from a conjugate point equatorial observational campaign (COPEX) conducted in Brazil during October to December 2002. The COPEX utilized digital ionosondes, digisondes, all-sky imagers and other different complementary instruments at the magnetic equatorial and conjugate point stations in the western longitude sector of Brazil. The campaign objective was to investigate the equatorial spread F/plasma bubble irregularity (ESF) generation conditions in terms of the ambient ionosphere-thermosphere properties along the magnetic flux tubes in which they occur. The COPEX digisonde observations permitted field line mapping of the conjugate E layers to dip equatorial F layer peak/bottomside, and are complemented by other digisondes at eastward longitudes in Brazil. Conjugate point symmetry/ asymmetry conditions of the equatorial ionization anomaly and associated ionosphere- thermosphere dynamics, disturbance electric fields and winds, arising from magnetosphere / ionosphere coupling and conductivity distributions are among the most suspected causes of the widely observed variability in the ESF intensity. These questions are addressed using the analysis of selected days during quiet and disturbed intervals of the capaign period.
UR: http://www.dae.inpe.br
DE: 2400 IONOSPHERE
DE: 2411 Electric fields (2712)
DE: 2435 Ionospheric disturbances
DE: 2437 Ionospheric dynamics
DE: 2736 Magnetosphere/ionosphere interactions
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting