Solar flares on September 16, 2025
The most powerful solar flare in 24 hours
C3.5 (normal) flare - September 16 at 7:58 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-04 (Dover) — summer time
List of solar flares for September 16, 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 |
|---|---|---|---|---|
| C1.6 | 17:53 | 18:02 | 18:08 | — |
| C3.5 | 07:54 | 07:58 | 08:01 | 4220 |
| C1.8 | 07:10 | 07:28 | 07:34 | 4223 |
| C1.7 | 06:49 | 07:00 | 07:10 | 4223 |
| C2.5 | 00:46 | 00:58 | 01:09 | 4217 |