Solar flares on September 16, 2025
The most powerful solar flare in 24 hours
C3.5 (normal) flare - September 16 at 5:58 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-06 (Calgary) — summer time
List of solar flares for September 16, 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 |
|---|---|---|---|---|
| C1.6 | 15:53 | 16:02 | 16:08 | — |
| C3.5 | 05:54 | 05:58 | 06:01 | 4220 |
| C1.8 | 05:10 | 05:28 | 05:34 | 4223 |
| C1.7 | 04:49 | 05:00 | 05:10 | 4223 |