Solar flares on September 13, 2025
The most powerful solar flare in 24 hours
C1.5 (normal) flare - September 13 at 5:14 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-03 (Halifax) — summer time
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 | 19:32 | 19:43 | 20:15 | 4211 |
| C1.2 | 18:47 | 19:06 | 19:23 | — |
| C1.2 | 15:57 | 16:05 | 16:12 | — |
| C1.5 | 04:33 | 05:14 | 05:44 | 4207 |
| C1.1 | 02:03 | 02:09 | 02:19 | 4207 |