Solar flares on September 16, 2025
The most powerful solar flare in 24 hours
C3.5 (normal) flare - September 16 at 9:28 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-02:30 (Saint john's) — summer time
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 | 19:23 | 19:32 | 19:38 | — |
| C3.5 | 09:24 | 09:28 | 09:31 | 4220 |
| C1.8 | 08:40 | 08:58 | 09:04 | 4223 |
| C1.7 | 08:19 | 08:30 | 08:40 | 4223 |
| C2.5 | 02:16 | 02:28 | 02:39 | 4217 |
| C1.8 | 00:24 | 00:34 | 00:39 | 4217 |