Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa33a1438m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA33A-1438
Physics
[2415] Ionosphere / Equatorial Ionosphere, [2441] Ionosphere / Ionospheric Storms, [6982] Radio Science / Tomography And Imaging, [7944] Space Weather / Ionospheric Effects On Radio Waves
Scientific paper
Experimental results of the reconstructed imaging in electron density (Ne), using the techniques of ionospheric tomography, are used to evaluate F-region ionospheric density gradients and large-scale structures during both geomagnetically quiet and disturbed periods. The magnetic latitudes that characterize the regions of the equatorial ionization anomaly (EIA) over Brazil, is subject to strong density structuring due to fountain effect and also due to space weather effects of magnetospheric disturbance electric fields and thermospheric winds. An adequate knowledge about the spatial and temporal variability and the maximum expected conditions of sharp changes in total electron content (TEC), associated with the EIA and storm time disturbance effects at equatorial latitudes, can provide essential information for the understanding of the physics and physical effects of ionospheric density gradients. TEC database from the Brazilian GPS network have been used to investigate the spatial-temporal variability of TEC and Ne latitude/altitude structure as function of local time, solar and geomagnetic activities. We present a statistical characterization of average magnitude and position of the steepest TEC and Ne gradients at latitudes surrounding the equatorial anomaly regions. The results reveal that the steepest gradients occur in an environment of increased background TEC during solar maximum and adjacent to the crests of the EIA. The characteristic and position of the density gradients during the disturbed periods differ significantly from the magnetic quiet pattern. However, in terms of magnitude the gradients at equatorial and low latitudes appear not to change significantly during both geomagnetic quiet and disturbed conditions.
de Paula Eurico R.
Kintner Paul M.
Mitchell Cathryn N.
Muella M. T.
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