Solar flares on September 15, 2025
The most powerful solar flare in 24 hours
C3.5 (normal) flare - September 15 at 6:31 PM
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+00
List of solar flares for September 15, 2025
The total number of solar flares of class C and higher — 9 flares
C class — 9 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.4 | 21:04 | 21:08 | 21:10 | 4217 |
| C1.3 | 20:54 | 21:01 | 21:04 | 4217 |
| C3.5 | 18:23 | 18:31 | 18:46 | 4213 |
| C1.6 | 13:10 | 13:17 | 13:22 | 4213 |
| C1.4 | 11:32 | 11:39 | 11:45 | 4213 |
| C2.1 | 09:52 | 09:55 | 10:00 | 4216 |
| C2.1 | 08:14 | 08:21 | 08:28 | 4217 |
| C1.6 | 07:02 | 07:09 | 07:21 | 4217 |
| C1.7 | 01:30 | 01:38 | 01:48 | 4217 |