Solar flares on December 18, 2025
The most powerful solar flare in 24 hours
C3.2 (normal) flare - December 18 at 1:50 AM
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-06 (Des Moines)
List of solar flares for December 18, 2025
The total number of solar flares of class C and higher — 3 flares
C class — 3 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.3 | 23:53 | 23:58 | 00:01 | 4307 |
| C1.9 | 23:34 | 23:43 | 23:49 | 4307 |
| C3.2 | 01:44 | 01:50 | 01:56 | 4312 |