Solar flares on December 13, 2025
The most powerful solar flare in 24 hours
C8.6 (normal) flare - December 13 at 3:51 AM
Solar activity index
Value as of the end of the day on December 13, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 12, 2025 to December 13, 2025
Time zone — UTC-07 (Cheyenne)
List of solar flares for December 13, 2025
The total number of solar flares of class C and higher — 6 flares
C class — 6 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.2 | 17:12 | 17:38 | 17:56 | 4304 |
| C2.4 | 10:55 | 10:58 | 11:18 | 4304 |
| C2.1 | 10:18 | 10:42 | 10:54 | — |
| C2.8 | 06:01 | 06:04 | 06:30 | 4304 |
| C8.6 | 03:36 | 03:51 | 04:02 | 4296 |
| C1.5 | 00:41 | 00:48 | 00:53 | 4308 |