Solar flares on December 20, 2025
The most powerful solar flare in 24 hours
M1.0 (strong) flare - December 20 at 2:53 AM
Solar activity index
Value as of the end of the day on December 20, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 19, 2025 to December 20, 2025
Time zone — UTC-05 (Kapuskasing)
List of solar flares for December 20, 2025
The total number of solar flares of class C and higher — 10 flares
C class — 9 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.8 | 21:14 | 21:24 | 21:32 | 4317 |
| C1.3 | 18:10 | 18:20 | 18:30 | 4317 |
| C3.1 | 14:58 | 15:05 | 15:07 | — |
| C2.8 | 14:48 | 14:55 | 14:58 | 4317 |
| C2.7 | 14:15 | 14:28 | 14:39 | 4314 |
| M1.0 | 02:36 | 02:53 | 03:06 | 4315 |
| C1.4 | 01:52 | 02:06 | 02:25 | 4315 |
| C1.3 | 01:08 | 01:14 | 01:23 | 4315 |
| C1.2 | 00:42 | 00:46 | 00:49 | — |
| C1.3 | 00:22 | 00:34 | 00:42 | — |