Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11300a07b&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue A8, CiteID A00A07
Physics
20
Ionosphere: Equatorial Ionosphere, Ionosphere: Electric Fields (2712), Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Ionosphere: Ionospheric Dynamics, Ionosphere: Modeling And Forecasting
Scientific paper
The occurrence of an additional layer, called F 3 layer, in the equatorial ionosphere at American, Indian, and Australian longitudes during the super double geomagnetic storm of 7-11 November 2004 is presented using observations and modeling. The observations show the occurrence, reoccurrence, and quick ascent to the topside ionosphere of unusually strong F 3 layer in Australian longitude during the first super storm (8 November) and in Indian longitude during the second super storm (10 November), all with large reductions in peak electron density (Nmax) and total electron content (GPS-TEC). The unusual F 3 layers can arise mainly from unusually strong fluctuations in the daytime vertical E × B drift as indicated by the observations and modeling in American longitude. The strongest upward E × B drift (or eastward prompt penetration electric field, PPEF) ever recorded (at Jicamarca) produces unusually strong F 3 layer in the afternoon hours (~1400-1600 LT) of PPEF, with large reductions in Nmax and TEC; the layer also reappears in the following evening (~1700-1800 LT) owing to an unusually large downward drift. At night, when the drift is unusually upward and strong, the F region splits into two layers.
Abdu Mangalathayil Ali
Alleyne Hugo
Balan Nanan
Fejer Bela G.
Lynn K.
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