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Solar flares in May 2011
C-class55
M-class2
X-class0
LargestM1.42011-05-29
Sunspot number61.8NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| May 2010 | 8 | 1 | 0 | M1.2 |
| May 2011 | 55 | 2 | 0 | M1.4 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2011-05-29 | 10:08 | 10:33 | 60 | M1.4 | – | 11226 |
| 2011-05-28 | 21:09 | 21:50 | 52 | M1.1 | – | 11226 |
| 2011-05-29 | 20:11 | 21:20 | 97 | C8.7 | – | 11227 |
| 2011-05-28 | 03:04 | 03:31 | 39 | C8.3 | – | 11226 |
| 2011-05-28 | 08:43 | 09:01 | 23 | C7.7 | – | 11226 |
| 2011-05-29 | 11:36 | 11:39 | 6 | C7.7 | – | 11226 |
| 2011-05-30 | 05:59 | 06:05 | 8 | C7.0 | – | 11226 |
| 2011-05-01 | 23:25 | 23:32 | 14 | C6.5 | – | 11199 |
| 2011-05-29 | 01:54 | 01:59 | 9 | C5.9 | – | 11224 |
| 2011-05-27 | 16:38 | 16:43 | 9 | C5.6 | – | 11226 |
| 2011-05-09 | 20:42 | 20:59 | 37 | C5.4 | – | – |
| 2011-05-28 | 10:22 | 10:30 | 59 | C5.3 | – | 11226 |
| 2011-05-15 | 23:25 | 23:34 | 16 | C4.8 | – | 11208 |
| 2011-05-29 | 01:33 | 01:42 | 12 | C4.6 | – | 11216 |
| 2011-05-28 | 08:01 | 08:06 | 8 | C4.4 | – | 11226 |
All times UTC. Until June 2017 classes are NOAA's reports of the time (GOES-15 and earlier included a 0.7 scaling factor); later classes come from calibrated GOES-16/18 data, so the same flare reads about 1.4× larger. Do not compare the two periods directly.
About this page
57 flares of class C or larger in May 2011; by M/X count it ranks 396 of 565 months.