Solar cycle 11
| 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
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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