Abstract

This paper deals with the analysis of anomalies on variations of total electron content (TEC) during fluctuating geomagnetic events through solar cycle 24 at Koudougou station (lat 12°15'N; long:-2°20'E). Study of anomalies was done by comparing the variations of TEC during solstice and equinox seasons and variations of TEC at equinoxes to those at solstices. Comparison was made taking into account solar cycle phases and seasons influences. Equinoctial asymmetry is recorded at ascending and maximum phases. Winter anomaly is observed all night (0000 LT-04 00 LT and 2000 LT-2300 LT) at solar maximum and at all times during the ascending phase, except around 0600 LT and 1800 LT. Semi-annual asymmetry is observed during all phases of solar cycle 24 during fluctuating events.

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