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Solar flares in August 2021
C-class41
M-class1
X-class0
LargestM4.72021-08-28
Sunspot number22.8NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| August 2020 | 2 | 0 | 0 | C2.0 |
| August 2021 | 41 | 1 | 0 | M4.7 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2021-08-28 | 05:39 | 06:11 | 43 | M4.7 | – | – |
| 2021-08-29 | 09:54 | 10:03 | 11 | C8.1 | – | – |
| 2021-08-29 | 00:34 | 00:44 | 15 | C7.4 | – | – |
| 2021-08-27 | 20:39 | 21:09 | 62 | C7.3 | – | – |
| 2021-08-28 | 05:01 | 05:05 | 6 | C7.0 | – | – |
| 2021-08-29 | 00:15 | 00:28 | – | C5.3 | – | – |
| 2021-08-28 | 08:38 | 08:46 | 19 | C4.2 | – | – |
| 2021-08-26 | 23:17 | 23:22 | 8 | C3.9 | – | – |
| 2021-08-20 | 15:50 | 15:57 | 10 | C3.0 | – | – |
| 2021-08-26 | 17:48 | 18:18 | 53 | C3.0 | – | – |
| 2021-08-29 | 17:01 | 17:30 | 49 | C3.0 | – | – |
| 2021-08-30 | 21:26 | 21:34 | 10 | C3.0 | – | – |
| 2021-08-28 | 11:47 | 11:55 | 16 | C2.8 | – | – |
| 2021-08-20 | 16:41 | 16:49 | 17 | C2.3 | – | – |
| 2021-08-30 | 16:20 | 16:24 | 7 | C2.0 | – | – |
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
42 flares of class C or larger in August 2021; by M/X count it ranks 447 of 565 months.