Solar cycle 24
Solar cycle 24 is the most recently completed solar cycle, the 24th since 1755, when extensive recording of solar sunspot activity began. It began in December 2008 with a minimum smoothed sunspot number of 2.2, and ended in December 2019. Activity was minimal until early 2010. It reached its maximum in April 2014 with a 23 months smoothed sunspot number of 81.8. This maximum value was substantially lower than other recent solar cycles, down to a level which had not been seen since cycles 12 to 15 (1878-1923).
| Solar cycle 24 | |
|---|---|
ISES Solar Cycle 24 Sunspot Number Progression | |
| Sunspot data | |
| Start date | December 2008 |
| End date | December 2019 |
| Duration (years) | 11.0 |
| Max count | 81.8 |
| Max count month | April 2014 |
| Min count | 2.2 |
| Spotless days | 489 |
| Cycle chronology | |
| Previous cycle | Solar cycle 23 (1996-2008) |
| Next cycle | Solar cycle 25 (2019-present) |
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