Responses of equatorial F region to different geomagnetic storms observed by GPS in the African sector

• Published in: Journal of Geophysical Research: Space Physics Vol. 116; no. A12
• Main Authors: Adewale, A. O., Oyeyemi, E. O., Adeloye, A. B., Ngwira, C. M., Athieno, R.
• Format: Journal Article
• Language: English
• Published: Washington Blackwell Publishing Ltd 01.12.2011
• Subjects: Atmospheric sciences; Electric fields; ionosphere; ionospheric storms; Magnetism; penetrating electric field; positive storm effects; Storms; TEC; Gabon; Africa
• ISSN: 0148-0227; 2169-9380; 2156-2202; 2169-9402
• DOI: 10.1029/2011JA016998

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. Key Points Prompt penetrations of electric field contribute to occurrence of positive storm Positive storm effects are more prevalent than the negative storm effects Positive storm effects are most pronounced in daytime