TOTAL ELECTRON CONTENT VARIATIONS DURING DIFFERENT GEOMAGNETIC ACTIVITIES IN ILE-IFE, NIGERIA Page No: 4141-4149

By: EI Akintufede, LG Olatunbosun, AO Olabode, AB Babinisi and EA. Ariyibi

Keywords: Equatorial ionisation anomaly, vertical TEC, global positioning system, international reference ionosphere

Abstract: GPS-derived vertical Total Electron content (TEC) recorded at Ile-Ife (Mlat. 7.52oN and Mlong. 4.28oE), Nigeria during the year 2011 for different geomagnetic activities was analyzed to investigate TEC variations. The results showed that TEC exhibit diurnal and seasonal variations, with equinoctial season recording the highest TEC during the daytime maximum. Winter anomaly was absent. Comparative results revealed that IRI-2012 underestimates measured TEC during the different geomagnetic activities in Ile-Ife. An average value of about 40% deviation between the modeled and measured TEC was obtained during moderate and intense geomagnetic activities, while that during low geomagnetic activities was about 11%.



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