Physics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11408309s&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue A8, CiteID A08309
Physics
7
Ionosphere: Equatorial Ionosphere, Ionosphere: Electric Fields (2712), Ionosphere: Ionospheric Storms (7949), Magnetospheric Physics: Magnetic Storms And Substorms (7954)
Scientific paper
The role of electrodynamics in producing additional stratifications in the equatorial F region (F 3 layer) at dawn and dusk during geomagnetic storms is discussed. Two cases of F 3 layer at dawn (0600-0730 LT on 5 October 2000 and 8 December 2000) and one case of F 3 layer at dusk (1600-1730 LT on 5 October 2000) are observed, for the first time, by the digital ionosonde at the equatorial station Trivandrum (8.5°N 77°E dip ˜ 0.5°N) in India. The unusual F 3 layers occurred during the geomagnetic storms and are associated with southward turning of interplanetary magnetic field B z , suggesting that eastward prompt penetration electric field could be the main cause of the F 3 layers. The dawn F 3 layer on 5 October is modeled using the Sheffield University Plasmasphere-Ionosphere Model by using the E × B drift estimated from the real height variation of the ionospheric peak during the morning period. The model qualitatively reproduces the dawn F 3 layer. While the existing F 2 layer rapidly drifts upward and forms the F 3 layer and topside ledge, a new layer forming at lower heights develops into the normal F 2 layer.
Bailey Graham J.
Balan Nanan
Kumar Pant Tarun
Ravindran Sudha
Sreeja V.
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