Author(s)

Ali Mahamat Nour¹, Ouattara Frédéric^1,2, Zerbo Jean Louis^2,3, Gyébré Aristide Marie Frédéric^1,2, Nanéma Emmanuel^1,2,4, Zougmoré François¹

¹Laboratoire de Matériaux et Environnement (LAME), UFR SEA Université de Ouagadougou, Ouagadougou, Burkina Faso.
²Laboratoire de Recherche en Energétique et Météorologie de l’Espace (LAREME), Université de Koudougou, Koudougou, Burkina Faso.
³Institut des Sciences Exactes et Appliquées (ISEA), Université Polytechnique de Bobo Dioulasso, Bobo Dioulasso, Burkina Faso.
⁴Centre National de Recherches Scientifiques et Techniques (CNRST), Institut de Recherches Scientifiques Appliquées et Technologies (IRSAT), Ouagadougou, Burkina Faso.

The statistical study of F2 layer critical frequency at Dakar station from 1971 to 1996 is carried out. This paper shows foF2 statistical diurnal for all geomagnetic activities and all seasons and that during solar maximum and minimum phases. It emerges that foF2 diurnal variation graphs at Dakar station exhibits the different types of foF2 profiles in African EIA regions. The type of profile depends on solar activity, season and solar phase. During solar minimum and under quiet time condition, data show the signature of a strength electrojet that is coupled with intense counter electrojet in the afternoon. Under disturbed conditions, mean intense electrojet is observed in winter during fluctuating and recurrent activities. Intense counter electrojet is seen under fluctuating and shock activities in all seasons coupled with strength electrojet in autumn. In summer and spring under all geomagnetic activity condition, there is intense counter electrojet. During solar maximum, in summer and spring there is no electrojet under geomagnetic activity conditions. Winter shows a mean intense electrojet. Winter and autumn are marked by the signature of the reversal electric field.

foF2 Diurnal Variation, Solar Cycle Phases, Geomagnetic Activity Classes, Seasonal Effects, E Region Electric Currents

Nour, A. , Frédéric, O. , Louis, Z. , Frédéric, G. , Emmanuel, N. and François, Z. (2015) Statistical Study of foF2 Diurnal Variation at Dakar Station from 1971 to 1996: Effect of Geomagnetic Classes of Activity on Seasonal Variation at Solar Minimum and Maximum. International Journal of Geosciences, 6, 201-208. doi: 10.4236/ijg.2015.63014.