Observations of the Variability in TEC during the Great Storm of October 2003

Details Observations of the Variability in TEC during the Great Storm of October 2003 Observations of the Variability in TEC during the Great Storm of October 2003

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa21b0351d&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA21B-0351

Physics

2427 Ionosphere/Atmosphere Interactions (0335), 2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities

Scientific paper

The great storm of October 2003 resulted in large scale variations in TEC. These variations are apparent as Storm Enhanced Densities (SEDs), Traveling Ionospheric Disturbances (TIDs), Sudden Increases in TEC (SITEC) and trough depletions. Using TEC values collected with a network of 260 GPS receivers, we have studied the ionospheric response to this great storm. In particular, we have focused on the ionospheric response to the transport of large-scale atmospheric gravity waves (AGW). The source of the AGW is the expansion and the subsequent relaxation of the high latitude atmosphere produced by the intense Joule heating deposited in the auroral regions during the great Halloween storm of October 29-30, 2003. Between 1500 and 2400 UT, GPS receivers located in North and South America measured strong TEC perturbations associated with the traveling AGW. TEC perturbations were observed to propagate from both north and south auroral regions toward the geographic equator. The excellent quality of the TEC measurements makes it possible to extract the temporal spectrum of the TEC perturbations. TEC perturbations containing a 1-hour temporal scale propagate at 1100 m/s. 3-hour scales propagate at 900 m/s. The latitudinal scale size of the TIDs is between 500 and 800 km. This presentation will illustrate these results together with demonstrations of the SED, SITEC and trough features observed during this great storm.

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