Astronomy:Solar cycle 11

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Solar cycle 11
PSM V05 D555 The photosphere and sun spots.jpg
Sunspots observed during solar cycle 11 (1873)
Sunspot data
Start dateMarch 1867
End dateDecember 1878
Duration (years)11.8
Max count234.0
Max count monthAugust 1870
Min count9.9
Spotless days1028
Cycle chronology
Previous cycleSolar cycle 10 (1855–1867)
Next cycleSolar 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 observed during the solar cycle was 234.0 (August 1870), and the starting minimum was 9.9.[3] During the minimum transit from solar cycle 11 to 12, there were a total of 1028 days with no sunspots (the highest recorded of any cycle transit to date).[4][5][6]

Strong auroral displays were observed in October 1870, February 1872, and August 1872.[7]

See also


  1. Kane, R.P. (2002), "Some Implications Using the Group Sunspot Number Reconstruction", Solar Physics 205 (2): 383–401, doi:10.1023/A:1014296529097, Bibcode2002SoPh..205..383K 
  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. Dr. Tony Phillips (11 July 2008). "What's Wrong with the Sun? (Nothing)". NASA. 
  6. Solaemon's Spotless Days Page. "[3]"
  7. Storms, Solar (28 July 2017). "Space Weather Newspaper Archives". 

External links

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