Solar flares on December 17, 2025
The most powerful solar flare in 24 hours
C2.0 (normal) flare - December 17 at 7:35 PM
Solar activity index
Value as of the end of the day on December 17, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 16, 2025 to December 17, 2025
Time zone — UTC-04 (Saint john)
List of solar flares for December 17, 2025
The total number of solar flares of class C and higher — 5 flares
C class — 5 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.7 | 23:05 | 23:15 | 23:31 | 4308 |
| C1.3 | 20:02 | 20:11 | 20:14 | 4307 |
| C2.0 | 19:20 | 19:35 | 19:41 | — |
| C1.0 | 05:48 | 05:55 | 06:00 | 4307 |
| C1.3 | 04:27 | 04:40 | 05:01 | 4307 |