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| Background Information | Background Information | |
| Solar cycle data | ||
The solar cycle data are retrieved from Solar Influences Data Analysis Center (SIDC) - Sunspot Index and Long-term Solar Observations (SILSO). The sun spot numbers (ssn) are yearly numbers.
| solar cycle nr. | start | stop | year of maximum | min. ssn | max. ssn |
|---|---|---|---|---|---|
| 18 | 1944.3 | 1954.5 | 1947.5 | 16.1 | 214.76 | 19 | 1954.5 | 1964.5 | 1957.5 | 6.6 | 269.3 | 20 | 1964.5 | 1976.5 | 1969.5 | 15.0 | 149.4 | 21 | 1976.5 | 1986.5 | 1979.5 | 18.4 | 220.1 | 22 | 1986.5 | 1996.5 | 1989.5 | 14.8 | 211.1 | 23 | 1996.5 | 2008.6 | 2000.5 | 11.6 | 173.9 | 24 | 2008.5 | 2019.5 | 2014.5 | 4.2 | 113.3 | 25 | 2019.5 | 2030.5 | - | - | - |
| year | ssn | year | ssn | year | ssn | year | ssn |
|---|---|---|---|---|---|---|---|
| 1944.5 | 16.1 | 1966.5 | 66.8 | 1988.5 | 123 | 2010.5 | 24.9 |
| 1945.5 | 55.3 | 1967.5 | 132.9 | 1989.5 | 211.1 | 2011.5 | 80.8 |
| 1946.5 | 154.3 | 1968.5 | 150 | 1990.5 | 191.8 | 2012.5 | 84.5 |
| 1947.5 | 214.7 | 1969.5 | 149.4 | 1991.5 | 203.3 | 2013.5 | 94 |
| 1948.5 | 193 | 1970.5 | 148 | 1992.5 | 133 | 2014.5 | 113.3 |
| 1949.5 | 190.7 | 1971.5 | 94.4 | 1993.5 | 76.1 | 2015.5 | 69.8 |
| 1950.5 | 118.9 | 1972.5 | 97.6 | 1994.5 | 44.9 | 2016.5 | 39.8 |
| 1951.5 | 98.3 | 1973.5 | 54.1 | 1995.5 | 25.1 | 2017.5 | 21.7 |
| 1952.5 | 45 | 1974.5 | 49.2 | 1996.5 | 11.6 | 2018.5 | 7.0 |
| 1953.5 | 20.1 | 1975.5 | 22.5 | 1997.5 | 28.9 | 2019.5 | 3.6 |
| 1954.5 | 6.6 | 1976.5 | 18.4 | 1998.5 | 88.3 | 2020.5 | 8.8 |
| 1955.5 | 54.2 | 1977.5 | 39.3 | 1999.5 | 136.3 | ||
| 1956.5 | 200.7 | 1978.5 | 131 | 2000.5 | 173.9 | ||
| 1957.5 | 269.3 | 1979.5 | 220.1 | 2001.5 | 170.4 | ||
| 1958.5 | 261.7 | 1980.5 | 218.9 | 2002.5 | 163.6 | ||
| 1959.5 | 225.1 | 1981.5 | 198.9 | 2003.5 | 99.3 | ||
| 1960.5 | 159 | 1982.5 | 162.4 | 2004.5 | 65.3 | ||
| 1961.5 | 76.4 | 1983.5 | 91 | 2005.5 | 45.8 | ||
| 1962.5 | 53.4 | 1984.5 | 60.5 | 2006.5 | 24.7 | ||
| 1963.5 | 39.9 | 1985.5 | 20.6 | 2007.5 | 12.6 | ||
| 1964.5 | 15 | 1986.5 | 14.8 | 2008.5 | 4.2 | ||
| 1965.5 | 22 | 1987.5 | 33.9 | 2009.5 | 4.8 |