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

  1. ↑ Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics 205(2), 383-401.
  2. ↑ "Did You Say the Sun Has Spots?". Space Today Online.
  3. ↑ "Sunspot numbers". SILSO Data Files. Royal Observatory of Belgium, Brussels. Retrieved 29 July 2014.
  4. ↑ Alvestad, Jan. "Solar Terrestrial Activity Report". Retrieved 29 July 2014.
  5. ↑ "Solar Cycle Progression - Recent Indices". NOAA. Retrieved 29 July 2014.
  6. ↑ "Spotless Days". SpaceWeather.com. Retrieved 29 July 2014.
  7. ↑ "What's Wrong with the Sun?". NASA Science. NASA. Retrieved 29 July 2014.
  8. ↑ Solaemon. "Solaemon's Spotless Days Page". Retrieved 29 July 2014.
  9. ↑ Phillips, A. (2008). "Solar Cycle 24 Begins". Science @ NASA.

External links

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