Solar flares on September 30, 2025
The most powerful solar flare in 24 hours
M2.7 (strong) flare - September 30 at 3:40 AM
Solar activity index
Value as of the end of the day on September 30, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 29, 2025 to September 30, 2025
Time zone — UTC-06 (Cheyenne) — summer time
List of solar flares for September 30, 2025
The total number of solar flares of class C and higher — 7 flares
C class — 4 | M class — 3 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.2 | 20:15 | 20:26 | 20:37 | 4232 |
| C7.8 | 19:15 | 19:30 | 19:54 | 4230 |
| C3.4 | 18:44 | 18:58 | 19:13 | — |
| C4.0 | 15:29 | 15:42 | 15:51 | 4226 |
| M1.8 | 06:02 | 06:27 | 06:48 | 4238 |
| M2.7 | 03:29 | 03:40 | 03:45 | 4226 |
| C2.8 | 03:15 | 03:21 | 03:24 | 4236 |