Table 1 Sunspot groups with maximum area of more than 3000 MSH and expected and observed maximum SXR flare class between 1879 and 2016 in the DHO catalog
From: Extremely large flares/multiple large flares expected from sunspot groups with large area
No. | Date | Maximum sunspot area (MSH) | Expected maximum SXR flare class | Region number | Observed maximum SXR flare (number of X-class flares) |
|---|---|---|---|---|---|
1 | 1947/04/08 | 6132 | X106.3 | 14,886 | NA |
2 | 1946/02/07 | 5202 | X83.1 | 14,417 | NA |
3 | 1951/05/19 | 4865 | X75.1 | 16,763 | NA |
4 | 1946/07/29 | 4720 | X71.8 | 14,585 | NA |
5 | 1947/03/12 | 4554 | X68.0 | 14,851 | NA |
6 | 2014/10/24 | 4419 | X65.0 | 12,192 | X2.0 (4) |
7 | 1989/03/14 | 4201 | X60.3 | 5395 | X15 (11) |
8 | 1990/11/16 | 3872 | X53.3 | 6368 | M7.5 (0) |
9 | 1938/01/21 | 3627 | X48.4 | 12,673 | NA |
10 | 1926/01/20 | 3619 | X48.2 | 9861 | NA |
11 | 1917/02/13 | 3467 | X45.2 | 7977 | NA |
12 | 2003/11/01 | 3388 | X43.7 | 10,486 | X28 (7) |
13 | 2001/03/29 | 3387 | X43.6 | 9393 | X20 (3) |
14 | 1937/10/05 | 3340 | X42.7 | 12,553 | NA |
15 | 1905/02/02 | 3339 | X42.7 | 5441 | NA |
16 | 1937/07/28 | 3303 | X42.0 | 12,455 | NA |
17 | 1984/04/26 | 3274 | X41.5 | 4474 | X13 (3) |
18 | 1991/03/23 | 3257 | X41.1 | 6555 | X9.4 (7) |
19 | 1989/06/16 | 3249 | X41.0 | 5528 | M9.3 (0) |
20 | 1991/10/27 | 3234 | X40.7 | 6891 | X6.1 (5) |
21 | 1968/02/01 | 3202 | X40.1 | 21,482 | NA |
22 | 1917/08/09 | 3178 | X39.7 | 8181 | NA |
23 | 1982/07/11 | 3092 | X38.1 | 3804 | X9.8 (5) |
24 | 1988/07/02 | 3047 | X37.2 | 5060 | M9.2 (0) |
25 | 1892/02/10 | 3038 | X37.1 | 2421 | NA |
26 | 1980/11/13 | 3030 | X36.9 | 2779 | X9.0 (4) |
27 | 1938/10/12 | 3003 | X36.4 | 13,024 | NA |