Solar flares on September 16, 2025
The most powerful solar flare in 24 hours
C3.5 (normal) flare - September 16 at 11:58 AM
Solar activity index
Value as of the end of the day on September 16, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 15, 2025 to September 16, 2025
Time zone — UTC+00
List of solar flares for September 16, 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 |
|---|---|---|---|---|
| C1.6 | 21:53 | 22:02 | 22:08 | — |
| C3.5 | 11:54 | 11:58 | 12:01 | 4220 |
| C1.8 | 11:10 | 11:28 | 11:34 | 4223 |
| C1.7 | 10:49 | 11:00 | 11:10 | 4223 |
| C2.5 | 04:46 | 04:58 | 05:09 | 4217 |
| C1.8 | 02:54 | 03:04 | 03:09 | 4217 |