Solar flares on December 21, 2025
The most powerful solar flare in 24 hours
M1.3 (strong) flare - December 21 at 12:27 PM
Solar activity index
Value as of the end of the day on December 21, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 20, 2025 to December 21, 2025
Time zone — UTC-06 (Winnipeg)
List of solar flares for December 21, 2025
The total number of solar flares of class C and higher — 15 flares
C class — 14 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.6 | 19:04 | 19:15 | 19:20 | 4317 |
| C2.3 | 18:22 | 18:30 | 18:34 | 4316 |
| C2.0 | 17:25 | 17:30 | 17:34 | 4316 |
| C2.2 | 16:28 | 16:34 | 16:37 | 4316 |
| C3.1 | 15:57 | 16:12 | 16:19 | 4316 |
| C6.2 | 14:51 | 15:01 | 15:07 | — |
| C4.0 | 14:16 | 14:24 | 14:32 | 4316 |
| C6.1 | 13:51 | 14:00 | 14:03 | — |
| C3.9 | 13:29 | 13:43 | 13:51 | 4316 |
| M1.3 | 12:12 | 12:27 | 12:36 | 4316 |
| C2.6 | 10:47 | 11:03 | 11:27 | 4316 |
| C1.4 | 09:52 | 09:58 | 10:05 | 4316 |
| C1.3 | 06:47 | 06:56 | 07:01 | 4315 |
| C1.3 | 06:11 | 06:23 | 06:29 | 4317 |
| C1.3 | 05:54 | 06:03 | 06:11 | 4316 |