Variation of Vertical Total Electron Content (TEC) Over West Africa during Geomagnetic Storms

Kingsley Chukwudi Okpala *

Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria.

Ernest Benjamin Ugwu

Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria.

Okwudili Joseph Attah

Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria.

Dominic Obiegbuna

Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria and Department of Science Laboratory Technology, University of Nigeria, Nsukka, Nigeria.

Rose Chigoziri Anamezie

Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria.

Friday Egbunu

Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria and Department of Physics, Kogi State University, Ayigba, Kogi State, Nigeria.

*Author to whom correspondence should be addressed.


Abstract

Changes in vertical total electron content (VTEC) over West Africa which were associated with four geomagnetic storms in 2015 have been studied. The spatial evolution of the quiet time TEC over West Africa for four months (vis; March, June, October and December) which may give rise to unique features of the storm TEC were also evaluated. Quiet-time VTEC (i.e Sq VTEC) was obtained using the hourly means of the international quietest days for each month when a storm of interest occurred. The change in TEC ( ) was obtained after removing the quiet time VTEC from the storm day VTEC.  A significant latitudinal variation in VTEC was observed at 22:00LT over West Africa and this was accompanied by the usual broad peak at about 14-17UT. The latitudinal disparity observed in the Sq  at 22.00LT was likely driven by the intesification of the fountain effect. The maximum   observed during the storms in 2015 were of the other of 16 TECU. These results have important implications for our present understanding of TEC evolution during a geomagnetic and its direct effect on the technologies that depend on it.

Keywords: Total electron content, geomagnetic storm, solar quiet day, Ionosphere


How to Cite

Okpala, Kingsley Chukwudi, Ernest Benjamin Ugwu, Okwudili Joseph Attah, Dominic Obiegbuna, Rose Chigoziri Anamezie, and Friday Egbunu. 2020. “Variation of Vertical Total Electron Content (TEC) Over West Africa During Geomagnetic Storms”. Physical Science International Journal 24 (5):52-63. https://doi.org/10.9734/psij/2020/v24i530193.

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