From: Extremely large flares/multiple large flares expected from sunspot groups with large area
Data length | Occurrence probability of sunspot area \(\ge\) X100 calculated using the DHO catalog | Occurrence probability of sunspot area \(\ge\) X100 calculated using the MA30 catalog | ||||
---|---|---|---|---|---|---|
30 years | 50 years | 100 years | 30 years | 50 years | 100 years | |
80 years (1879–1958) | 0.92 | 0.99 | 1.00 | 0.92 | 0.99 | 1.00 |
100 years (1879–1978) | 0.85 | 0.96 | 1.00 | 0.85 | 0.96 | 1.00 |
120 years (1879–1998) | 0.73 | 0.89 | 0.99 | 0.74 | 0.90 | 0.99 |
138 years (1879–2016) | 0.70 | 0.87 | 0.98 | 0.76 | 0.91 | 0.99 |