Solar cycle 11

Solar cycle 11
Sunspots observed during solar cycle 11 (1873)
Sunspot Data
Start date	March 1867
End date	December 1878
Duration (years)	11.8
Max count	140.3
Max count month	August 1870
Min count	2.2
Spotless days	1028
Cycle chronology
Previous cycle	Solar cycle 10 (1855-1867)
Next cycle	Solar cycle 12 (1878-1890)

Solar prominences observed by Carl Frederik Fearnley during solar cycle 11 (1872–1873).

Solar cycle 11 was the eleventh solar cycle since 1755, when extensive recording of solar sunspot activity began.^[1]^[2] The solar cycle lasted 11.8 years, beginning in March 1867 and ending in December 1878. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 140.3 (August 1870), and the minimum was 2.2.^[3] There were a total of approximately 1028 days with no sunspots during this cycle (the highest recorded of any cycle to date).^[4]^[5]^[6]

Strong auroral displays were observed in October 1870, February 1872, and August 1872.^[7]

References

↑ Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics 205(2), 383-401.
↑ "The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010.
↑ SIDC Monthly Smoothed Sunspot Number. ""
↑ Spotless Days. ""
↑ What's Wrong with the Sun? (Nothing) more information: Spotless Days. ""
↑ Solaemon's Spotless Days Page. ""
↑ http://www.solarstorms.org/SRefStorms.html

Solar cycles

18th century	Solar cycle 1 (1755 March – 1766 June) Solar cycle 2 (1766 June – 1775 June) Solar cycle 3 (1775 June – 1784 September) Solar cycle 4 (1784 September – 1798 May) Solar cycle 5 (1798 May – 1810 December)

19th century	Solar cycle 6 (1810 December – 1823 May) Solar cycle 7 (1823 May – 1833 November) Solar cycle 8 (1833 November – 1843 July) Solar cycle 9 (1843 July – 1855 December) Solar cycle 10 (1855 December – 1867 March) Solar cycle 11 (1867 March – 1878 December) Solar cycle 12 (1878 December – 1890 March) Solar cycle 13 (1890 March – 1902 February)

20th century	Solar cycle 14 (1902 February – 1913 August) Solar cycle 15 (1913 August – 1923 August) Solar cycle 16 (1923 August – 1933 September) Solar cycle 17 (1933 September – 1944 February) Solar cycle 18 (1944 February – 1954 April) Solar cycle 19 (1954 April – 1964 October) Solar cycle 20 (1964 October – 1976 June) Solar cycle 21 (1976 June – 1986 September) Solar cycle 22 (1986 September – 1996 May) Solar cycle 23 (1996 May – 2008 January)

21st century	Solar cycle 24 (2008 January – present)

List of solar cycles

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Solar cycle 11

See also

References