Ionospheric TEC Response to Geomagnetic Storms Occurred on 15-20 March 2013 and 2015 over the Eastern Africa Region
American Journal of Environmental Science and Engineering
Volume 3, Issue 4, December 2019, Pages: 103-111
Received: Apr. 12, 2019;
Accepted: May 29, 2019;
Published: Dec. 13, 2019
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Emmanuel Daudi Sulungu, Department of Physics, College of Natural and Mathematical Sciences, The University of Dodoma, Dodoma, Tanzania
Christian Uiso, Department of Physics, College of Natural and Applied Sciences, University of Dares Salaam, Dares salaam, Tanzania
In this paper we present characteristics of the ionosphere over eastern Africa region in response to two geomagnetic storms of March 2013 and March 2015 that occurred at the same date and time but with different intensities. Ionospheric TEC has been derived from the IGS network of ground based dual-frequency GPS receivers from four stations, namely Eldoret (0.29°N, 35.29°E), Dodoma (6.19°S, 35.75°E), Malindi (2.99°S, 40.19°E) and Mtwara (10.26°S, 40.17°E) within the Eastern Africa region. The interplanetary magnetic field (IMF) Bz and corresponding Dst index, solar wind speed (Vsw) and density (Np) were used to represent the evolution of the storm events. Our results showed that, the behavior of the ionosphere over eastern Africa region during the two geomagnetic storms was similar. During both storms the main phases occurred on 17th of March. However, the main phase of the storm in 2015 had more intensity than that of 2013 but the same duration, and they were followed by a long-duration slow recovery with values that did not return to levels prior to the onset of the storm. The enhancement and reduction of TECv were observed at almost all stations at different times. The results from both storms also show that, there was a pre-reversal enhancement especially at stations that lie close to the equatorial region compared to the stations far from the equatorial region.
Emmanuel Daudi Sulungu,
Ionospheric TEC Response to Geomagnetic Storms Occurred on 15-20 March 2013 and 2015 over the Eastern Africa Region, American Journal of Environmental Science and Engineering.
Vol. 3, No. 4,
2019, pp. 103-111.
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