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Table 2 Sunspot groups with maximum area of more than 3000 MSH and expected and observed maximum SXR flare class between 1879 and 2016 in the MA20 catalogue

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

1989/03/16

4823

X74.1

5395

X15 (11)

5

1946/07/29

4720

X71.8

14,585

NA

6

1947/03/12

4554

X68.0

14,851

NA

7

2014/10/25

4534

X67.6

12,192

X2.0 (4)

8

1989/06/16

3753

X50.9

5528

M9.3 (0)

9

1938/01/21

3627

X48.4

12,673

NA

10

1926/01/20

3619

X48.2

9861

NA

11

2003/10/29

3486

X45.6

10,486

X28 (7)

12

1917/02/13

3467

X45.2

7977

NA

13

2001/03/30

3447

X44.8

9393

X20 (3)

14

1991/10/27

3428

X44.4

6891

X6.1 (5)

15

1937/10/05

3340

X42.7

12,553

NA

16

1905/02/02

3339

X42.7

5441

NA

17

1937/07/28

3303

X42.0

12,455

NA

18

1991/03/23

3233

X40.7

6555

X9.4 (7)

19

1988/07/01

3217

X40.4

5060

M9.2 (0)

20

1968/02/01

3202

X40.1

21,482

NA

21

1990/11/20

3179

X39.7

6368

M7.5 (0)

22

1917/08/09

3178

X39.7

8181

NA

23

1989/09/04

3098

X38.2

5669

X1.3 (3)

24

2000/09/23

3096

X38.1

9169

X1.2 (1)

25

1982/06/15

3039

X37.1

3776

X3.6 (5)

26

1892/02/10

3038

X37.1

2421

NA

27

1938/10/12

3003

X36.4

13,024

NA

  1. NA: not available