Solar cycle 2

Solar cycle 2
Drawing of a sunspot from 1774, illustrating the Wilson effect
Sunspot Data
Start date	June 1766
End date	June 1775
Duration (years)	9
Max count	115.8
Max count month	September 1769
Min count	7.2
Cycle chronology
Previous cycle	Solar cycle 1 (1755-1766)
Next cycle	Solar cycle 3 (1775-1784)

Solar cycle 2 was the second solar cycle since 1755, when extensive recording of solar sunspot activity began.^[1]^[2] The solar cycle lasted 9 years, beginning in June 1766 and ending in June 1775. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 115.8 (September 1769), and the minimum was 7.2.^[3]

Sunspot observations by Alexander Wilson during this period established the Wilson effect.

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. ""

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 2

See also

References