List of solar cycles
From Wikipedia, the free encyclopedia
The following is a list of solar cycles (sometimes called sunspot cycles), tracked since 1755.[1][2][3]
| Cycle | Started | Finished | Duration (years) | Maximum (monthly SSN (Smoothed Sunspot Number))[4] | Minimum (monthly SSN; end of cycle)[5][6] | Spotless days (end of cycle)[7][8][9] |
|---|---|---|---|---|---|---|
| Solar cycle 1 | 1755 March | 1766 June | 11.3 | 86.5 (June 1761) | 11.2 | |
| Solar cycle 2 | 1766 June | 1775 June | 9.0 | 115.8 (Sep 1769) | 7.2 | |
| Solar cycle 3 | 1775 June | 1784 September | 9.3 | 158.5 (May 1778) | 9.5 | |
| Solar cycle 4 | 1784 September | 1798 May | 13.7 | 141.2 (Feb 1788) | 3.2 | |
| Solar cycle 5 | 1798 May | 1810 December | 12.6 | 49.2 (Feb 1805) | 0.0 | |
| Solar cycle 6 | 1810 December | 1823 May | 12.4 | 48.7 (May 1816) | 0.1 | |
| Solar cycle 7 | 1823 May | 1833 November | 10.5 | 71.5 (Nov 1829) | 7.3 | |
| Solar cycle 8 | 1833 November | 1843 July | 9.8 | 146.9 (Mar 1837) | 10.6 | |
| Solar cycle 9 | 1843 July | 1855 December | 12.4 | 131.9 (Feb 1848) | 3.2 | ~654 |
| Solar cycle 10 | 1855 December | 1867 March | 11.3 | 98.0 (Feb 1860) | 5.2 | ~406 |
| Solar cycle 11 | 1867 March | 1878 December | 11.8 | 140.3 (Aug 1870) | 2.2 | ~1028 |
| Solar cycle 12 | 1878 December | 1890 March | 11.3 | 74.6 (Dec 1883) | 5.0 | ~736 |
| Solar cycle 13 | 1890 March | 1902 February | 11.9 | 87.9 (Jan 1894) | 2.7 | ~938 |
| Solar cycle 14 | 1902 February | 1913 August | 11.5 | 64.2 (Feb 1906) | 1.5 | ~1019 |
| Solar cycle 15 | 1913 August | 1923 August | 10.0 | 105.4 (Aug 1917) | 5.6 | 534 |
| Solar cycle 16 | 1923 August | 1933 September | 10.1 | 78.1 (Apr 1928) | 3.5 | 568 |
| Solar cycle 17 | 1933 September | 1944 February | 10.4 | 119.2 (Apr 1937) | 7.7 | 269 |
| Solar cycle 18 | 1944 February | 1954 April | 10.2 | 151.8 (May 1947) | 3.4 | 446 |
| Solar cycle 19 | 1954 April | 1964 October | 10.5 | 201.3 (Mar 1958) | 9.6 | 227 |
| Solar cycle 20 | 1964 October | 1976 June | 11.7 | 110.6 (Nov 1968) | 12.2 | 272 |
| Solar cycle 21 | 1976 June | 1986 September | 10.3 | 164.5 (Dec 1979) | 12.3 | 273 |
| Solar cycle 22 | 1986 September | 1996 May | 9.7 | 158.5 (Jul 1989) | 8.0 | 309 |
| Solar cycle 23 | 1996 May | 2008 January [10] | 12.6 | 120.8 (Mar 2000) | 1.7 | 821 [11] |
| Solar cycle 24 | 2008 January [10] | |||||
| Mean | 10.6 | 114.1 | 5.8 |
References [edit]
- ^ 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.
- ^ Phillips, A. (2008). "Solar Cycle 24 Begins". Science @ NASA.
- ^ SIDC Monthly Smoothed Sunspot Number. "[1]"
- ^ Monthly solar cycle data. "[2]"
- ^ Solar Cycle Progression: Recent Solar Indices. "[3]"
- ^ Spotless Days. "[4]"
- ^ What's Wrong with the Sun? (Nothing) more information: Spotless Days. "[5]"
- ^ Solaemon's Spotless Days Page. "[6]"
- ^ a b Recent Solar Indices. "[7]"
- ^ Spotless days. "[8]"
External links [edit]
- 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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