Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa31c..08f&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA31C-08
Physics
[2400] Ionosphere, [2435] Ionosphere / Ionospheric Disturbances, [2441] Ionosphere / Ionospheric Storms, [2481] Ionosphere / Topside Ionosphere
Scientific paper
The 24-hour global mean Total Electron Content (TEC) varies significantly on periods as short as two to three days. Analyses of ground based GPS receiver measurements, CHAMP satellite GPS receiver measurements, and Jason-1 altimeter measurements yield consistent pictures of highly structured changes in the global mean TEC. In particular, we have focused on three time periods of high geomagnetic activity: October through November, 2003, November, 2004, and May through June, 2005. During these time periods, rapid changes in the global mean TEC appear related to disturbances in the DST index, changes in the solar wind speed, and spikes in the solar wind density. Comparison of CHAMP data (measurements of TEC above approximately 400 kilometers altitude) and ground based data reveals a correlation between the DST index and the proportion of TEC that is below CHAMP. This correlation suggests that DST related global enhancements are most significant above 400 kilometers.
Coster Anthea J.
Fienberg A. T.
Zhang Sheng
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