Electron density and height at the F 1 region minimum gradient at high solar activity for an equatorial station

The occurrence of ƒ o F 1 at high solar activity is very scanty. The occurrence of the L condition is what predominates during this solar epoch. Electron density N F 1 and the height hF 1 at the point of minimum gradient in ionospheric profiles at high solar activity were studied for an equatorial station. N F 1 is dependent on solar zenith angle ( x ). The cos( x ) indexes for winter, spring, summer, and autumn were found to be 0.78, 0.59, 0.76, and 0.65, respectively. Height h F 1 showed no diurnal or seasonal effects and has an average value of 167 km. The results obtained were compared with those of low solar activity from a previous study.