List of solar cycles
The following is a list of solar cycles (sometimes called sunspot cycles), tracked since 1755.[1][2]
Cycle | Started | Finished | Duration (years) | Maximum (monthly SSN (Smoothed Sunspot Number))[3] | Minimum (monthly SSN; end of cycle)[4][5] | Spotless days (end of cycle)[6][7][8] |
---|---|---|---|---|---|---|
Solar cycle 1 | 1755 August | 1766 March | 11.3 | 86.5 (June 1761) | 11.2 | |
Solar cycle 2 | 1766 March | 1775 August | 9.0 | 115.8 (Sep 1769) | 7.2 | |
Solar cycle 3 | 1775 August | 1784 June | 9.3 | 158.5 (May 1778) | 9.5 | |
Solar cycle 4 | 1784 June | 1798 June | 13.7 | 141.2 (Feb 1788) | 3.2 | |
Solar cycle 5 | 1798 June | 1810 September | 12.6 | 49.2 (Feb 1805) | 0.0 | |
Solar cycle 6 | 1810 September | 1823 December | 12.4 | 48.7 (May 1816) | 0.1 | |
Solar cycle 7 | 1823 December | 1833 October | 10.5 | 71.5 (Nov 1829) | 7.3 | |
Solar cycle 8 | 1833 October | 1843 September | 9.8 | 146.9 (Mar 1837) | 10.6 | |
Solar cycle 9 | 1843 September | 1855 March | 12.4 | 131.9 (Feb 1848) | 3.2 | ~654 |
Solar cycle 10 | 1855 March | 1867 February | 11.3 | 98.0 (Feb 1860) | 5.2 | ~406 |
Solar cycle 11 | 1867 February | 1878 September | 11.8 | 140.3 (Aug 1870) | 2.2 | ~1028 |
Solar cycle 12 | 1878 September | 1890 June | 11.3 | 74.6 (Dec 1883) | 5.0 | ~736 |
Solar cycle 13 | 1890 June | 1902 September | 11.9 | 87.9 (Jan 1894) | 2.7 | ~938 |
Solar cycle 14 | 1902 September | 1913 December | 11.5 | 64.2 (Feb 1906) | 1.5 | ~1019 |
Solar cycle 15 | 1913 December | 1923 May | 10.0 | 105.4 (Aug 1917) | 5.6 | 534 |
Solar cycle 16 | 1923 May | 1933 September | 10.1 | 78.1 (Apr 1928) | 3.5 | 568 |
Solar cycle 17 | 1933 September | 1944 January | 10.4 | 119.2 (Apr 1937) | 7.7 | 269 |
Solar cycle 18 | 1944 January | 1954 February | 10.2 | 151.8 (May 1947) | 3.4 | 446 |
Solar cycle 19 | 1954 February | 1964 October | 10.5 | 201.3 (Mar 1958) | 9.6 | 227 |
Solar cycle 20 | 1964 October | 1976 May | 11.7 | 110.6 (Nov 1968) | 12.2 | 272 |
Solar cycle 21 | 1976 May | 1986 March | 10.3 | 164.5 (Dec 1979) | 12.3 | 273 |
Solar cycle 22 | 1986 March | 1996 June | 9.7 | 158.5 (Jul 1989) | 8.0 | 309 |
Solar cycle 23 | 1996 June | 2008 January | 11.7 | 120.8 (Mar 2000) | 1.7 | 821 |
Solar cycle 24 | 2008 January[9] | Still ongoing | 81.9 (Apr 2014) | |||
Mean | 11.1 | 114.1 | 5.8 |
References
- ↑ Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics 205(2), 383-401.
- ↑ "Did You Say the Sun Has Spots?". Space Today Online.
- ↑ "Sunspot numbers". SILSO Data Files. Royal Observatory of Belgium, Brussels. Retrieved 29 July 2014.
- ↑ Alvestad, Jan. "Solar Terrestrial Activity Report". Retrieved 29 July 2014.
- ↑ "Solar Cycle Progression - Recent Indices". NOAA. Retrieved 29 July 2014.
- ↑ "Spotless Days". SpaceWeather.com. Retrieved 29 July 2014.
- ↑ "What's Wrong with the Sun?". NASA Science. NASA. Retrieved 29 July 2014.
- ↑ Solaemon. "Solaemon's Spotless Days Page". Retrieved 29 July 2014.
- ↑ Phillips, A. (2008). "Solar Cycle 24 Begins". Science @ NASA.
External links
- Solar Influences Data Analysis Center (SIDC)
- Graphics of historic solar cycles at the SIDC page
- Near realtime solar images from SOHO
- Official list of solar cycles
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