The months of start and end, as well as the values of minimum and maximum solar activity expressed in terms of F 10.7, are shown for each of the solar cycles 21, 22 and 23. The solar cycle 24, which is not practically considered in this study, is included for completeness.
|Solar cycle||Initial month–final month||Minimum F 10.7–maximum F 10.7 (10−22 Wm−2 Hz−1)|
|21||June 1976–September 1986||72.7–207.5|
|22||September 1986–May 1996||72.8–201.4|
|23||May 1996–December 2008||69.6–164.7|
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