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	193.0
Max count month	September 1769
Min count	18.6
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 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 observed during the solar cycle was 193.0 (September 1769), and the starting minimum was 18.6.^[3]

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

See also

• List of solar cycles

References

• v
• t
• e

Solar cycles

18th century

1740–1759	Solar cycle 1 (1755 Feb – 1766 Jun)
1760–1779	Solar cycle 2 (1766 Jun – 1775 Jun) Solar cycle 3 (1775 Jun – 1784 Sep)
1780–1799	Solar cycle 4 (1784 Sep – 1798 Apr) Solar cycle 5 (1798 Apr – 1810 Aug)

19th century

1800–1819	Solar cycle 6 (1810 Aug – 1823 May)
1820–1839	Solar cycle 7 (1823 May – 1833 Nov) Solar cycle 8 (1833 Nov – 1843 Jul)
1840–1859	Solar cycle 9 (1843 Jul – 1855 Dec) Solar cycle 10 (1855 Dec – 1867 Mar)
1860–1879	Solar cycle 11 (1867 Mar – 1878 Dec) Solar cycle 12 (1878 Dec – 1890 Mar)
1880–1899	Solar cycle 13 (1890 Mar – 1902 Jan)

20th century

1900–1919	Solar cycle 14 (1902 Jan – 1913 Jul) Solar cycle 15 (1913 Jul – 1923 Aug)
1920–1939	Solar cycle 16 (1923 Aug – 1933 Sep) Solar cycle 17 (1933 Sep – 1944 Feb)
1940–1959	Solar cycle 18 (1944 Feb – 1954 Apr) Solar cycle 19 (1954 Apr – 1964 Oct)
1960–1979	Solar cycle 20 (1964 Oct – 1976 Mar) Solar cycle 21 (1976 Mar – 1986 Sep)
1980–1999	Solar cycle 22 (1986 Sep – 1996 Aug) Solar cycle 23 (1996 Aug – 2008 Dec)

21st century

2000–2019	Solar cycle 24 (2008 Dec – 2019 Dec) Solar cycle 25 (2019 Dec – present)

• List of solar cycles
• List of solar storms
• List of solar maxima and minima