Solar flares on September 15, 2025
The most powerful solar flare in 24 hours
C3.5 (normal) flare - September 15 at 11:31 AM
Solar activity index
Value as of the end of the day on September 15, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 14, 2025 to September 15, 2025
Time zone — UTC-07 (Seattle) — summer time
List of solar flares for September 15, 2025
The total number of solar flares of class C and higher — 10 flares
C class — 10 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.5 | 21:46 | 21:58 | 22:09 | 4217 |
| C1.8 | 19:54 | 20:04 | 20:09 | 4217 |
| C1.4 | 14:04 | 14:08 | 14:10 | 4217 |
| C1.3 | 13:54 | 14:01 | 14:04 | 4217 |
| C3.5 | 11:23 | 11:31 | 11:46 | 4213 |
| C1.6 | 06:10 | 06:17 | 06:22 | 4213 |
| C1.4 | 04:32 | 04:39 | 04:45 | 4213 |
| C2.1 | 02:52 | 02:55 | 03:00 | 4216 |
| C2.1 | 01:14 | 01:21 | 01:28 | 4217 |
| C1.6 | 00:02 | 00:09 | 00:21 | 4217 |