Solar flares on September 27, 2025
The most powerful solar flare in 24 hours
M1.1 (strong) flare - September 27 at 7:14 AM
Solar activity index
Value as of the end of the day on September 27, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 26, 2025 to September 27, 2025
Time zone — UTC+00 (Reykjavik)
List of solar flares for September 27, 2025
The total number of solar flares of class C and higher — 20 flares
C class — 17 | M class — 3 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.1 | 20:53 | 20:58 | 21:03 | 4233 |
| C5.4 | 19:44 | 19:54 | 20:01 | 4232 |
| C7.6 | 17:51 | 17:56 | 17:59 | 4232 |
| C6.8 | 17:39 | 17:49 | 17:51 | 4232 |
| C3.1 | 16:45 | 16:49 | 16:51 | 4226 |
| C2.9 | 16:16 | 16:27 | 16:45 | 4233 |
| C2.0 | 15:08 | 15:15 | 15:21 | 4233 |
| C7.3 | 12:59 | 13:16 | 13:25 | 4233 |
| C3.0 | 11:33 | 11:38 | 11:41 | 4233 |
| C3.2 | 11:12 | 11:22 | 11:33 | 4233 |
| C2.7 | 10:06 | 10:19 | 10:34 | 4233 |
| C2.8 | 09:28 | 09:38 | 09:51 | 4233 |
| C2.3 | 08:01 | 08:09 | 08:22 | 4233 |
| M1.1 | 07:03 | 07:14 | 07:18 | 4232 |
| C3.9 | 06:22 | 06:30 | 06:35 | 4226 |
| C4.9 | 05:30 | 05:34 | 05:37 | — |
| M1.1 | 04:18 | 04:23 | 04:27 | 4226 |
| M1.0 | 03:29 | 03:59 | 04:18 | 4226 |
| C3.6 | 02:32 | 02:40 | 02:44 | 4232 |
| C8.0 | 00:28 | 00:42 | 01:00 | 4226 |