Solar flares on December 20, 2025
The most powerful solar flare in 24 hours
M1.0 (strong) flare - December 20 at 12:53 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-07 (Cheyenne)
List of solar flares for December 20, 2025
The total number of solar flares of class C and higher — 7 flares
C class — 6 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.8 | 19:14 | 19:24 | 19:32 | 4317 |
| C1.3 | 16:10 | 16:20 | 16:30 | 4317 |
| C3.1 | 12:58 | 13:05 | 13:07 | — |
| C2.8 | 12:48 | 12:55 | 12:58 | 4317 |
| C2.7 | 12:15 | 12:28 | 12:39 | 4314 |
| M1.0 | 00:36 | 00:53 | 01:06 | 4315 |
| C1.4 | 23:52 | 00:06 | 00:25 | 4315 |