Solar Flare WatchHome › Flare history › 2011
Solar flares in April 2011
C-class103
M-class3
X-class0
LargestM1.82011-04-22
Sunspot number81.7NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| April 2010 | 1 | 0 | 0 | C2.2 |
| April 2011 | 103 | 3 | 0 | M1.8 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2011-04-22 | 04:35 | 04:57 | 39 | M1.8 | – | 11195 |
| 2011-04-15 | 17:02 | 17:12 | 26 | M1.3 | – | 11190 |
| 2011-04-22 | 15:47 | 15:53 | 24 | M1.2 | – | 11195 |
| 2011-04-21 | 09:38 | 09:48 | 20 | C8.5 | – | 11195 |
| 2011-04-22 | 11:07 | 11:25 | 30 | C7.7 | – | 11195 |
| 2011-04-16 | 13:51 | 14:14 | 38 | C5.7 | – | 11190 |
| 2011-04-22 | 16:56 | 17:07 | 18 | C5.5 | – | 11195 |
| 2011-04-16 | 00:34 | 00:57 | 34 | C5.2 | – | 11190 |
| 2011-04-14 | 05:20 | 05:27 | 13 | C4.9 | – | 11193 |
| 2011-04-21 | 14:37 | 14:51 | 23 | C4.9 | – | 11195 |
| 2011-04-21 | 21:51 | 22:07 | 48 | C4.5 | – | 11195 |
| 2011-04-22 | 17:41 | 17:54 | 26 | C4.2 | – | 11195 |
| 2011-04-20 | 19:30 | 19:39 | 19 | C4.0 | – | 11195 |
| 2011-04-29 | 00:17 | 00:26 | 16 | C3.8 | – | 11203 |
| 2011-04-16 | 16:34 | 16:53 | 34 | C3.7 | – | 11185 |
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
106 flares of class C or larger in April 2011; by M/X count it ranks 361 of 565 months.