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Table 3 Number of sunspot area more than 3700 MSH for 100-year periods in the DHO and MA20 catalogues

From: Extremely large flares/multiple large flares expected from sunspot groups with large area

Data period Number of sunspot area of more than 3700 MSH in the DHO catalogue Number of sunspot area of more than 3700 MSH in the MA20 catalogue
1879−1978 41 41
1889−1988 41 41
189 −1998 46 46
1909−2008 46 46
Average 44 \(\pm\) 2.9 44 \(\pm\) 2.9