Solar flares on December 18, 2025
The most powerful solar flare in 24 hours
C3.2 (normal) flare - December 18 at 3:50 PM
Solar activity index
Value as of the end of the day on December 18, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 17, 2025 to December 18, 2025
Time zone — UTC+08 (Irkutsk)
List of solar flares for December 18, 2025
The total number of solar flares of class C and higher — 4 flares
C class — 4 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.2 | 15:44 | 15:50 | 15:56 | 4312 |
| C1.7 | 11:05 | 11:15 | 11:31 | 4308 |
| C1.3 | 08:02 | 08:11 | 08:14 | 4307 |
| C2.0 | 07:20 | 07:35 | 07:41 | — |