Conjugate Point Equatorial Experiments in Brazil: Preliminary results on Space Weather Related Variabilities in Spread F and Ionization Anomaly.

Details Conjugate Point Equatorial Experiments in Brazil: Preliminary results on Space Weather Related Variabilities in Spread F and Ionization Anomaly. Conjugate Point Equatorial Experiments in Brazil: Preliminary results on Space Weather Related Variabilities in Spread F and Ionization Anomaly.

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh52b..05a&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH52B-05

Other

2400 Ionosphere, 2411 Electric Fields (2712), 2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

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.

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