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.

See also

References

  1. Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics 205(2), 383-401.
  2. "The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010.
  3. SIDC Monthly Smoothed Sunspot Number. ""
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