Solar cycle 11

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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]

See also[edit]

References[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 Spots?". Space Today Online. Retrieved 12 August 2010. 
  3. ^ SIDC Monthly Smoothed Sunspot Number. "[1]"
  4. ^ Spotless Days. "[2]"
  5. ^ What's Wrong with the Sun? (Nothing) more information: Spotless Days. "[3]"
  6. ^ Solaemon's Spotless Days Page. "[4]"
  7. ^ http://www.solarstorms.org/SRefStorms.html