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

Table 3

Years of the different solar-cycle phases and their 𝑅_𝑧 mean value.

Solar-cycles	Solar-cycle phases
	Minimum	Increasing	Maximum	Decreasing	Years and 𝑅𝑧 mean
20	1964-1965	1966-1967	1968–1970	1971–1974	Years
	12.6	70.4	105.3	52	𝑅𝑧 mean
21	1975-1976	1977-1978	1979–1982	1983-1984	Years
	14.1	60	141.6	56.3	𝑅𝑧 mean
22	1985-1986	1987	1988-1989	1992–1994	Years
	15.7	29.4	136.5	59.6	𝑅𝑧 mean