Open AccessResponses of equatorial F region to different geomagnetic storms observed by GPS in the African sector
Author(s) -
Adewale A. O.,
Oyeyemi E. O.,
Adeloye A. B.,
Ngwira C. M.,
Athieno R.
Publication year - 2011
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2011ja016998
Subject(s) - geomagnetic storm , storm , ionosphere , total electron content , daytime , low latitude , atmospheric sciences , latitude , earth's magnetic field , geology , climatology , geophysics , tec , geodesy , physics , magnetic field , oceanography , quantum mechanics
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.