Solar Flare WatchHome › Flare history › 2021
Solar flares in December 2021
C-class182
M-class8
X-class0
LargestM1.82021-12-20
Sunspot number69.4NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| December 2020 | 12 | 0 | 0 | C7.4 |
| December 2021 | 182 | 8 | 0 | M1.8 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2021-12-20 | 11:12 | 11:36 | 42 | M1.8 | – | – |
| 2021-12-28 | 03:50 | 04:01 | 19 | M1.8 | – | – |
| 2021-12-28 | 15:59 | 16:11 | 20 | M1.6 | – | – |
| 2021-12-05 | 06:58 | 07:19 | 37 | M1.4 | – | – |
| 2021-12-21 | 11:31 | 11:44 | 17 | M1.4 | – | – |
| 2021-12-22 | 06:54 | 07:06 | 26 | M1.3 | – | – |
| 2021-12-17 | 00:39 | 00:51 | 16 | M1.2 | – | – |
| 2021-12-21 | 07:43 | 07:50 | 13 | M1.1 | – | – |
| 2021-12-31 | 06:46 | 06:56 | 19 | C9.8 | – | – |
| 2021-12-22 | 17:55 | 18:08 | 30 | C8.8 | – | – |
| 2021-12-15 | 10:31 | 10:44 | 15 | C8.1 | – | – |
| 2021-12-31 | 19:32 | 19:46 | 29 | C8.1 | – | – |
| 2021-12-24 | 03:25 | 03:42 | 24 | C7.4 | – | – |
| 2021-12-04 | 23:21 | 23:59 | 52 | C7.1 | – | – |
| 2021-12-28 | 07:29 | 07:44 | 27 | C7.0 | – | – |
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
190 flares of class C or larger in December 2021; by M/X count it ranks 273 of 565 months.