Occurrence of Elevated Total Electron Content in the Dusk Sector During Associated with F-Region Structuring at Tropical Latitudes

Details Occurrence of Elevated Total Electron Content in the Dusk Sector During Associated with F-Region Structuring at Tropical Latitudes Occurrence of Elevated Total Electron Content in the Dusk Sector During Associated with F-Region Structuring at Tropical Latitudes

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa52a..08m&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA52A-08

Physics

2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere

Scientific paper

We examine the total electron content (TEC) derived from dual-frequency Global Positioning System (GPS) receivers during geomagnetically active events where airglow images of tropical F-region emissions show anomalous structuring. The airglow data are typified by structures that are reminiscent of quiet-time medium- scale traveling ionospheric disturbances (MSTIDs) in terms of their orientation, propagation velocity and wavelength. However, during storm-time events, there is significantly more small-scale structuring seen in the airglow data and larger variations in TEC than during quiet-time MSTID events. These structures may be associated with mid-latitude spread-F. We suggest that the development of these structures is due to the presence of an increased background total electron content, at times factors of 5 times higher than quiet- time values, caused by the redistribution of equatorial plasma by storm-time penetration electric fields in the dusk sector as suggested by Basu et al. (2001). We present data collected during several storm-time events in the Pacific and American sectors during which simultaneous and near-collocated imaging and GPS data are available.

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