Solar flares on October 17, 2025
The most powerful solar flare in 24 hours
M1.3 (strong) flare - October 17 at 11:32 AM
Solar activity index
Value as of the end of the day on October 17, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 16, 2025 to October 17, 2025
Time zone — UTC-05 (Montgomery) — summer time
List of solar flares for October 17, 2025
The total number of solar flares of class C and higher — 13 flares
C class — 7 | M class — 6 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.1 | 21:26 | 21:39 | 21:47 | 4246 |
| C9.5 | 21:18 | 21:24 | 21:26 | 4246 |
| C2.9 | 21:05 | 21:09 | 21:14 | 4246 |
| M1.0 | 19:23 | 19:40 | 19:49 | 4246 |
| M1.2 | 11:47 | 11:58 | 12:08 | 4246 |
| M1.3 | 11:14 | 11:32 | 11:47 | 4246 |
| M1.0 | 09:22 | 09:32 | 09:36 | 4246 |
| M1.1 | 07:27 | 07:45 | 08:01 | 4246 |
| C6.1 | 07:02 | 07:06 | 07:17 | 4246 |
| C7.2 | 05:42 | 05:46 | 05:49 | 4246 |
| C6.5 | 05:30 | 05:37 | 05:42 | 4246 |
| C6.7 | 05:14 | 05:20 | 05:30 | 4246 |
| C8.0 | 00:48 | 00:54 | 00:57 | 4248 |