Seasonal, Diurnal, and Solar-Cycle Variations of Electron Density at Two West Africa Equatorial Ionization Anomaly Stations

Table 2

Predominance of March or September equinoctial peak for different solar-cycle phases.

Solar cycle phases	Solar cycles						Nature of peak predominance
	Ouagadougou station			Dakar station
	20	21	22	20	21	22
Minimum	X	X	X				March/April
				X	X	X	September/October
Increasing	X						March/April
		X	X	X	X	X	September/October
Maximum							March/April
	X	X	X	X	X	X	September/October
Decreasing	X	X	X		X	X	March/April
				X			September/October