Solar flares on September 28, 2025
The most powerful solar flare in 24 hours
M6.4 (strong) flare - September 28 at 8:43 AM
Solar activity index
Value as of the end of the day on September 28, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 27, 2025 to September 28, 2025
Time zone — UTC+00
List of solar flares for September 28, 2025
The total number of solar flares of class C and higher — 18 flares
C class — 17 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C5.8 | 23:41 | 23:46 | 23:48 | 4233 |
| C6.3 | 23:24 | 23:35 | 23:41 | 4233 |
| C3.3 | 22:10 | 22:17 | 22:21 | — |
| C5.5 | 21:43 | 21:50 | 21:56 | 4235 |
| C9.6 | 20:17 | 20:34 | 20:51 | 4233 |
| C7.4 | 19:37 | 19:56 | 20:01 | 4232 |
| C2.9 | 19:12 | 19:21 | 19:27 | 4236 |
| C3.7 | 17:35 | 17:42 | 17:46 | 4232 |
| C3.5 | 16:38 | 16:46 | 16:50 | — |
| C3.6 | 14:35 | 14:40 | 14:48 | 4233 |
| C9.9 | 13:26 | 13:31 | 13:34 | 4233 |
| C9.0 | 13:12 | 13:24 | 13:26 | 4233 |
| C3.2 | 12:46 | 12:55 | 13:03 | 4233 |
| C3.6 | 11:29 | 11:42 | 11:55 | 4233 |
| C3.0 | 10:48 | 10:54 | 10:56 | 4232 |
| M6.4 | 08:34 | 08:43 | 08:49 | 4232 |
| C2.3 | 07:02 | 07:07 | 07:25 | 4233 |
| C2.8 | 00:52 | 01:01 | 01:10 | 4233 |