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Solar flares in April 2021
C-class21
M-class1
X-class0
LargestM1.12021-04-19
Sunspot number24.8NOAA SWPC
Flares per day (C and above)
M/X flares per day
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2021-04-19 | 23:19 | 23:42 | 39 | M1.1 | – | – |
| 2021-04-22 | 20:02 | 20:11 | 17 | C8.5 | – | – |
| 2021-04-22 | 09:14 | 09:21 | 26 | C4.3 | – | – |
| 2021-04-22 | 04:10 | 04:35 | – | C3.8 | – | – |
| 2021-04-22 | 10:40 | 10:49 | 22 | C3.7 | – | – |
| 2021-04-22 | 12:18 | 12:27 | 23 | C2.8 | – | – |
| 2021-04-22 | 05:00 | 05:06 | 9 | C2.6 | – | – |
| 2021-04-25 | 01:16 | 01:35 | 34 | C2.6 | – | – |
| 2021-04-22 | 14:13 | 14:30 | 29 | C2.5 | – | – |
| 2021-04-23 | 23:08 | 23:12 | 6 | C2.4 | – | – |
| 2021-04-22 | 07:16 | 07:23 | 10 | C2.3 | – | – |
| 2021-04-23 | 22:39 | 22:54 | – | C2.2 | – | – |
| 2021-04-20 | 11:51 | 12:15 | 46 | C1.9 | – | – |
| 2021-04-22 | 05:50 | 05:57 | 11 | C1.7 | – | – |
| 2021-04-21 | 01:18 | 01:29 | 22 | C1.5 | – | – |
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
22 flares of class C or larger in April 2021; by M/X count it ranks 446 of 565 months.