Solar flares on September 13, 2025
The most powerful solar flare in 24 hours
C1.5 (normal) flare - September 13 at 8:14 AM
Solar activity index
Value as of the end of the day on September 13, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 12, 2025 to September 13, 2025
Time zone — UTC+00
List of solar flares for September 13, 2025
The total number of solar flares of class C and higher — 5 flares
C class — 5 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.1 | 22:32 | 22:43 | 23:15 | 4211 |
| C1.2 | 21:47 | 22:06 | 22:23 | — |
| C1.2 | 18:57 | 19:05 | 19:12 | — |
| C1.5 | 07:33 | 08:14 | 08:44 | 4207 |
| C1.1 | 05:03 | 05:09 | 05:19 | 4207 |