Solar flares on October 4, 2025
The most powerful solar flare in 24 hours
C5.5 (normal) flare - October 4 at 1:42 AM
Solar activity index
Value as of the end of the day on October 4, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 3, 2025 to October 4, 2025
Time zone — UTC+00
List of solar flares for October 4, 2025
The total number of solar flares of class C and higher — 11 flares
C class — 11 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.1 | 23:17 | 23:23 | 23:26 | 4241 |
| C2.0 | 22:02 | 22:05 | 22:11 | — |
| C3.0 | 18:50 | 19:05 | 19:11 | 4230 |
| C2.7 | 18:37 | 18:45 | 18:50 | 4230 |
| C3.5 | 17:45 | 17:52 | 17:56 | 4241 |
| C3.5 | 04:55 | 05:02 | 05:09 | 4232 |
| C3.2 | 04:07 | 04:14 | 04:16 | 4242 |
| C4.7 | 03:10 | 03:22 | 03:31 | 4236 |
| C5.5 | 01:36 | 01:42 | 01:47 | 4242 |
| C2.7 | 00:49 | 00:54 | 00:58 | 4242 |
| C3.4 | 00:25 | 00:35 | 00:41 | 4242 |