Solar cycle 12

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Solar cycle 12
Sunspots recorded during solar cycle 12 (1 September 1883).
Sunspot Data
Start date December 1878
End date March 1890
Duration (years) 11.3
Max count 74.6
Max count month December 1883
Min count 5.0
Spotless days 736
Cycle chronology
Previous cycle Solar cycle 11 (1867-1878)
Next cycle Solar cycle 13 (1890-1902)


Solar cycle 12 was the twelfth solar cycle since 1755, when extensive recording of solar sunspot activity began.[1][2] The solar cycle lasted 11.3 years, beginning in December 1878 and ending in March 1890. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 74.6 (December 1883), and the minimum was 5.[3] There were a total of approximately 736 days with no sunspots during this cycle.[4][5][6] A very bright blood-red aurora display happened over New York on 16 April 1882, while significant communication disturbances occurred.[7] A geomagnetic storm later in that year produced the aurora of November 17, 1882.

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