Solar flares on September 16, 2025
The most powerful solar flare in 24 hours
C3.5 (normal) flare - September 16 at 9:28 PM
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+09:30 (Adelaide)
List of solar flares for September 16, 2025
The total number of solar flares of class C and higher — 8 flares
C class — 8 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.5 | 21:24 | 21:28 | 21:31 | 4220 |
| C1.8 | 20:40 | 20:58 | 21:04 | 4223 |
| C1.7 | 20:19 | 20:30 | 20:40 | 4223 |
| C2.5 | 14:16 | 14:28 | 14:39 | 4217 |
| C1.8 | 12:24 | 12:34 | 12:39 | 4217 |
| C1.4 | 06:34 | 06:38 | 06:40 | 4217 |
| C1.3 | 06:24 | 06:31 | 06:34 | 4217 |
| C3.5 | 03:53 | 04:01 | 04:16 | 4213 |