Solar cycle 11
Solar activity from March 1867 to December 1878
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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]
Start dateMarch 1867
End dateDecember 1878
Duration (years)11.8
Max count234.0
| 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 | 234.0 |
| Max count month | August 1870 |
| Min count | 9.9 |
| Spotless days | 1028 |
| Cycle chronology | |
| Previous cycle | Solar cycle 10 (1855–1867) |
| Next cycle | Solar cycle 12 (1878–1890) |
Strong auroral displays were observed in October 1870, February 1872, and August 1872.[7]
