Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa51a1210s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA51A-1210
Physics
[2481] Ionosphere / Topside Ionosphere
Scientific paper
We have used more than 40 million Total Electron Content (TEC) observations obtained from the GPS TRSR (TurboRogue Space Receiver) receiver onboard the Jason-1 spacecraft. The TEC measurements, which correspond to an altitude from 1336 km to 20,200 km and cover the seven year period from January 2002 to December 2008, were used to determine the global morphology of the plasmaspheric TEC including its local time, latitude, longitude, season, solar cycle, and geomagnetic activity dependence. It was found that the plasmaspheric TEC increases by about 10 - 30 % from low to high solar flux conditions with the largest variations occurring during equinox at low latitudes. During periods of low solar flux the plasmaspheric TEC is largely independent of the geomagnetic activity level, whereas during high solar flux conditions it slightly decreases with increasing geomagnetic activity at low latitudes during the night. These variations were found for all three seasons (equinox, June and December solstices). At higher latitudes, TEC increases are found during all three seasons as geomagnetic activity increases. The plasmaspheric TEC values also show significant variations with local time, latitude, longitude and season. For example, during equinox and low solar flux conditions, longitudinally averaged plasmaspheric TEC values at low latitudes change by about 10 % from day to night. At middle latitudes, the daytime and nighttime TEC values are very similar and of the order of 2 TECU. Significant longitudinal variations in the plasmaspheric TEC at low latitudes were found during all three seasons. The details of the longitudinal dependence, however, are found to be different during all three seasons.
Scherliess Ludger
Shim Jihye
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