Solar flares on September 17, 2025
The most powerful solar flare in 24 hours
C2.3 (normal) flare - September 17 at 8:41 PM
Solar activity index
Value as of the end of the day on September 17, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 16, 2025 to September 17, 2025
Time zone — UTC+05 (Ufa)
List of solar flares for September 17, 2025
The total number of solar flares of class C and higher — 3 flares
C class — 3 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.3 | 20:35 | 20:41 | 20:43 | 4216 |
| C1.7 | 17:13 | 17:19 | 17:21 | 4216 |
| C1.6 | 02:53 | 03:02 | 03:08 | — |