Solar cycle 12
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
References
- ↑ Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics 205(2), 383-401.
- ↑ "The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010.
- ↑ SIDC Monthly Smoothed Sunspot Number. ""
- ↑ Spotless Days. ""
- ↑ What's Wrong with the Sun? (Nothing) more information: Spotless Days. ""
- ↑ Solaemon's Spotless Days Page. ""
- ↑ http://www.solarstorms.org/SRefStorms.html
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