Local time dependence of the prompt ionospheric response for the November 2004 superstorms

Details Local time dependence of the prompt ionospheric response for the November 2004 superstorms Local time dependence of the prompt ionospheric response for the November 2004 superstorms

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa43a..05m&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SA43A-05

Physics

2411 Electric Fields (2712), 2441 Ionospheric Storms (7949)

Scientific paper

The global nature of prompt penetrating electric fields suggests that specific local time dependencies should exist. The east-west orientation of the undershielded zonal electric field at low latitudes should be reversed between day and night for an observer on Earth. Dawn-dusk directed electric fields during daytime lead to plasma uplift and the "dayside superfountain" increasing the total electron content (TEC) of the ionosphere at low to middle latitudes by a factor of ten or more for intense storms. In the midnight sector, the penetration electric field orientation should lead to plasma downdraft, and the likely reduction of TEC. Some of these effects have been studied previously in a limited number of longitude/local time sectors, but no systematic study exists during positive phase storms over a wide range of sectors. We will focus attention on the local time dependence of TEC changes during the November 2004 superstorms, which are known to include a positive storm phase on the dayside. We will use data from the globally distributed network of ground-based GPS receivers and ionospheric data from the GPS receiver onboard the CHAMP satellite that measures total electron content above the satellite altitude of approximately 400 km. The global distribution of the ground receivers, and fixed local time of the satellite orbit are used to isolate and examine local time dependencies of the ionospheric response during the storm period. This approach complements detailed observations from radar that are fixed to specific locations on Earth for which the local time is changing.

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