Solar flares on September 4, 2025
The most powerful solar flare in 24 hours
M1.4 (strong) flare - September 4 at 8:16 PM
Solar activity index
Value as of the end of the day on September 4, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 3, 2025 to September 4, 2025
Time zone — UTC-05 (Pierre) — summer time
List of solar flares for September 4, 2025
The total number of solar flares of class C and higher — 8 flares
C class — 6 | M class — 2 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.4 | 20:08 | 20:16 | 20:21 | 4207 |
| C3.3 | 18:23 | 18:36 | 19:07 | 4210 |
| C2.9 | 16:34 | 16:44 | 16:53 | 4197 |
| M1.0 | 08:36 | 08:44 | 08:49 | 4207 |
| C2.5 | 08:19 | 08:26 | 08:36 | 4211 |
| C2.8 | 05:48 | 05:55 | 05:59 | 4207 |
| C2.1 | 04:15 | 04:24 | 04:32 | 4199 |
| C9.2 | 00:22 | 00:32 | 00:37 | 4207 |