Solar flares on September 15, 2025
The most powerful solar flare in 24 hours
C3.5 (normal) flare - September 15 at 2:31 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-04 (Lansing) — summer time
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 |
|---|---|---|---|---|
| C1.8 | 22:54 | 23:04 | 23:09 | 4217 |
| C1.4 | 17:04 | 17:08 | 17:10 | 4217 |
| C1.3 | 16:54 | 17:01 | 17:04 | 4217 |
| C3.5 | 14:23 | 14:31 | 14:46 | 4213 |
| C1.6 | 09:10 | 09:17 | 09:22 | 4213 |
| C1.4 | 07:32 | 07:39 | 07:45 | 4213 |
| C2.1 | 05:52 | 05:55 | 06:00 | 4216 |
| C2.1 | 04:14 | 04:21 | 04:28 | 4217 |
| C1.6 | 03:02 | 03:09 | 03:21 | 4217 |