Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11612319a&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A12, CiteID A12319
Physics
Ionosphere: Equatorial Ionosphere, Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Ionosphere: Ionospheric Irregularities, Ionosphere: Ionospheric Storms (7949), Magnetospheric Physics: Magnetic Storms And Substorms (4305, 7954)
Scientific paper
This article presents the first results regarding the investigation of the response of the equatorial ionospheric F region in the African sector during geomagnetic storm periods between April 2000 and November 2007 using GPS-derived vertical total electron content observed at Libreville, Gabon (0.35°N, 9.67°E, dip latitude -8.05°S). We performed a superposed epoch analysis of the storms by defining the start time of the epoch as the storm onset time. During geomagnetic storms, the altered electric fields contribute significantly to the occurrence of negative and positive ionospheric storm effects. Our results showed that the positive storm effects are more prevalent than the negative storm effects and generally last longer irrespective of storm onset times. Also, the positive storm effects are most pronounced in the daytime than in the premidnight and postmidnight periods.
Adeloye A. B.
Adewale A. O.
Athieno R.
Ngwira Chigomezyo M.
Oyeyemi Elijah O.
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