Magnetic storm effects on the morphology of the equatorial F2-layer

Abstract

Magnetic storm effects on the F2-Layer at Ibadan (lat. 7.4°N, long. 3.9°E, magnetic dip 6°S) were observed over a solar cycle period (1956–1966). During the period of high solar activity day-time decreases in NmF2 occur during the initial phase of storms. The main and early part of the recovery phases of storms cause either increases or no significant changes in the build-up interval (0500–0900 h L.T.) of the F2 layer usually, increases being most frequent during the March equinox season. This same part of the storm causes increases in NmF2 in the day-time (0900–1800 h L.T.) and night-time (1800-0800 h L.T.) intervals usually, at all seasons of the year. Similar effects occur during the period of low solar activity, but on a reduced scale.