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Home  >  Volume 27 (July 2014)

39. Predicted Variations of Electron Density at Some Fixed Height of the Ionosphere over Benin City Nigeria by S.O. Azi,E. Omugbeand F. Bakare.Volume27, (July, 2014), pp 323 – 328
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The variations of the electron density in someregions of the ionosphere over Benin City (6.3°N, 5.6°E), Nigeria have been investigated. In order to investigate the solar cycle, altitude, and local time dependence of electron densities fluctuations, data from 2002, a year of high solar activity and 2008, a year of very low solar activity have been collected from the International Reference Ionosphere (IRI-2012 model). The data covers all twelve months and 24 hours of the day. Our results revealed that for the periods of high solar activity (HSA) and low solar activity (LSA), the ionospheric electron densities at the height of 120km have characteristics trend of maxima occurring at noon. The electron densities rose from about 06.00LT and peaked at 12.00LT at noon before dropping sharply at 18.00LT. At the peak of the F_2-layer, a predominance of pre noonmaximum electron densities (N_m F_2) were observed for HSA year and a predominance of post noon peaks of N_m F_2 were recorded for LSA year. Furthermore our results show that the expected minimum formation of N_m F_2 around noon was not observed in the month of March for the year of HSA. Instead a peak value of N_m F_2 appeared at midday. The anomaly confirmed in the result revealed that the morphology of N_m F_2 depends on different locations for a given solar activity: Hence the electron density enhancement is primarily caused by solar control of the ionosphere.

Keywords:Ionosphere, IRI-2012 model, electron density, solar activity