Solar cycle 2
| 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 | 115.8 |
| Max count month | September 1769 |
| Min count | 7.2 |
| Cycle chronology | |
| Previous cycle | Solar cycle 1 (1755-1766) |
| Next cycle | Solar cycle 3 (1775-1784) |
Solar cycle 2 was the second solar cycle since 1755, when extensive recording of solar 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 (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 115.8 (September 1769), and the minimum was 7.2.[3]
Sunspot observations by Alexander Wilson during this period established the Wilson effect.
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. ""
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