Solar cycle 2
Solar activity from June 1766 to June 1775
Solar cycle 2 | |
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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) |
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]
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, 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".
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