Solar flares on December 16, 2025
The most powerful solar flare in 24 hours
C1.9 (normal) flare - December 16 at 7:51 AM
Solar activity index
Value as of the end of the day on December 16, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 15, 2025 to December 16, 2025
Time zone — UTC-06 (Chicago)
List of solar flares for December 16, 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 |
|---|---|---|---|---|
| C1.1 | 11:46 | 11:59 | 12:06 | — |
| C1.9 | 07:47 | 07:51 | 07:55 | — |
| C1.5 | 07:36 | 07:43 | 07:47 | — |