Solar flares on September 23, 2025
The most powerful solar flare in 24 hours
M1.0 (strong) flare - September 23 at 3:34 AM
Solar activity index
Value as of the end of the day on September 23, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 22, 2025 to September 23, 2025
Time zone — UTC-07 (Seattle) — summer time
List of solar flares for September 23, 2025
The total number of solar flares of class C and higher — 9 flares
C class — 8 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.5 | 20:44 | 20:51 | 21:01 | — |
| C5.5 | 20:23 | 20:31 | 20:37 | 4226 |
| C6.7 | 19:15 | 19:29 | 19:40 | 4223 |
| C2.9 | 18:15 | 18:41 | 19:00 | 4224 |
| C2.3 | 18:01 | 18:08 | 18:15 | 4224 |
| C2.0 | 15:34 | 15:43 | 15:54 | 4224 |
| C1.9 | 11:17 | 11:25 | 11:41 | 4230 |
| M1.0 | 03:24 | 03:34 | 03:38 | 4217 |
| C2.5 | 02:07 | 02:20 | 02:34 | 4228 |