Solar cycle 3

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Solar cycle 3
Sunspot Data
Start date June 1775
End date September 1784
Duration (years) 9.3
Max count 158.5
Max count month May 1778
Min count 9.5
Cycle chronology
Previous cycle Solar cycle 2 (1766-1775)
Next cycle Solar cycle 4 (1784-1798)
William Herschel began observing sunspots during this period.

Solar cycle 3 was the third solar cycle since 1755, when extensive recording of solar sunspot activity began.[1][2] The solar cycle lasted 9.3 years, beginning in June 1775 and ending in September 1784. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 158.5 (May 1778), and the minimum was 9.5.[3] The maximum is identical with that of solar cycle 22, where the peak of 158.5 occurred in July 1989, making it the equal third highest peak on record.[4]

William Herschel began observing sunspots during this period.[5]

See also[edit]


  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 Donuts?". Space Today Online. Retrieved 12 August 2010. 
  3. ^ SIDC Monthly Smoothed Sunspot Number. "[1]"
  4. ^ Wilson, Robert M.; Hathaway, David H.; Reichmann, Edwin J. (August 1996). On the Importance of Cycle Minimum in Sunspot Cycle Prediction (NASA Technical Paper 3648) (PDF). 
  5. ^ Vaquero, J.M.; Vázquez, M. (2009). The Sun Recorded Through History. Springer. p. 79. ISBN 0387927905.