Solar cycle 2 was the second solar cycle since 1755, when extensive recording of sunspot activity began.[1][2] The solar cycle lasted 9 years, beginning in June 1766 and ending in June 1775. The maximum smoothed sunspot number observed during the solar cycle was 193.0 (September 1769), and the starting minimum was 18.6.[3]
| Solar cycle 2 | |
|---|---|
 Drawing of a sunspot from 1774, illustrating the Wilson effect | |
| Sunspot data | |
| Start date | June 1766 |
| End date | June 1775 |
| Duration (years) | 9 |
| Max count | 193.0 |
| Max count month | September 1769 |
| Min count | 18.6 |
| Cycle chronology | |
| Previous cycle | Solar cycle 1 (1755–1766) |
| Next cycle | Solar cycle 3 (1775–1784) |
Sunspot observations by Alexander Wilson during this period established the Wilson effect.
See also
editReferences
edit- ^ Kane, R.P. (2002), "Some Implications Using the Group Sunspot Number Reconstruction", Solar Physics, 205 (2): 383–401, Bibcode:2002SoPh..205..383K, doi:10.1023/A:1014296529097
- ^ "The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010.
- ^ "SIDC Monthly Smoothed Sunspot Number".
