Number of solar cycle | Minimum Rz < 20 | Increasing 20 ≤ RZ ≤ 100 | Maximum Rz > 100 | Decreasing 100 ≥ RZ ≥ 20 |
20 |
|
|
| 1971-1975 |
21 | 1976 | 1977-1978 | 1979-1982 | 1983-1985 |
22 | 1986 | 1987-1988 | 1989-1991 | 1992-1995 |
23 | 1996 |
|
|
|