Solar flares on September 4, 2025
The most powerful solar flare in 24 hours
M1.0 (strong) flare - September 4 at 2:44 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+01 (London) — 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 — 7 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.9 | 22:34 | 22:44 | 22:53 | 4197 |
| M1.0 | 14:36 | 14:44 | 14:49 | 4207 |
| C2.5 | 14:19 | 14:26 | 14:36 | 4211 |
| C2.8 | 11:48 | 11:55 | 11:59 | 4207 |
| C2.1 | 10:15 | 10:24 | 10:32 | 4199 |
| C9.2 | 06:22 | 06:32 | 06:37 | 4207 |
| C2.5 | 01:30 | 01:37 | 01:47 | 4199 |
| C3.4 | 00:49 | 01:01 | 01:12 | 4211 |