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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A comparative study of TEC response for the African equatorial and mid-latitudes during storm conditions
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 102, Year 2013
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Description
The solar wind effects on the Earth's environment are studied for their basic scientific values and crucial practical impacts on technological systems. This paper reports results of Total Electron Content (TEC) changes during two successive ionospheric storms of 7-12 November 2004 using GPS data derived from dual frequency receivers located at African equatorial and midlatitudes. In the geographic coordinate system, equatorial TEC variability is considered over Libreville (0.36°N, 9.67°E), Gabon and Mbarara (0.60°S, 30.74°E), Uganda. TEC over midlatitude stations Sutherland (32.38°S, 20.81°E) and Springbok (29.67°S, 17.88°E), South Africa are analysed. The analysis of the storm time ionospheric variability over South Africa was undertaken by comparing the critical frequency of the F2 layer (foF2) and the peak height of the F2 layer (hmF2) values obtained from Grahamstown (33.30°S, 26.53°E) and Madimbo (22.4°S, 30.9°E) ionosonde measurements. During the analysed storm period it is observed that GPS TEC for midlatitudes was depleted significantly with a corresponding depletion in foF2, due to the reduction in GUVI O/N2 ratio as observed from its global maps. Over the equatorial latitudes, positive storm effects are more dominant especially during the storm main phase. Negative storm effects are observed over both mid and equatorial latitudes during the recovery phase. A shift in equatorial TEC enhancement (from one GPS station to another) is observed during magnetic storms and has been partially attributed to passage of Travelling Ionospheric Disturbances (TIDs). Magnetometer data over the International Real-time Magnetic Observatory Network (intermagnet) station, Addis Ababa, AAE (9.03°N, 38.77°E) has been used to help with the explanation of possible causes of equatorial ionospheric TEC dynamics during the analysed magnetic storm period. © 2013 Elsevier Ltd.
Authors & Co-Authors
Habarulema, John Bosco
South Africa, Pretoria
South African National Space Agency
South Africa, Grahamstown
Rhodes University
McKinnell, Lee Anne
South Africa, Pretoria
South African National Space Agency
South Africa, Grahamstown
Rhodes University
Burešová, Dalia
Czech Republic, Prague
Institute of Atmospheric Physics of the Academy of Sciences of the Czech Republic
Zhang, Yongliang
United States, Laurel
Johns Hopkins University Applied Physics Laboratory
Seemala, Gopi K.
Japan, Uji
Research Institute for Sustainable Humanosphere
Ngwira, Chigomezyo M.
United States, Washington, D.c.
The Catholic University of America
United States, Greenbelt
Nasa Goddard Space Flight Center
Chum, J.
Czech Republic, Prague
Institute of Atmospheric Physics of the Academy of Sciences of the Czech Republic
Opperman, Ben D.L.
South Africa, Pretoria
South African National Space Agency
Statistics
Citations: 49
Authors: 8
Affiliations: 7
Identifiers
Doi:
10.1016/j.jastp.2013.05.008
ISSN:
13646826
Study Locations
Gabon
South Africa
Uganda