Solar flares on October 17, 2025
The most powerful solar flare in 24 hours
M1.3 (strong) flare - October 17 at 10:58 PM
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-08 (Anchorage) — summer time
List of solar flares for October 17, 2025
The total number of solar flares of class C and higher — 16 flares
C class — 8 | M class — 8 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C6.0 | 23:35 | 23:48 | 23:55 | 4246 |
| M1.3 | 22:49 | 22:58 | 23:04 | 4246 |
| M1.2 | 22:32 | 22:39 | 22:44 | 4246 |
| C9.9 | 21:43 | 22:05 | 22:19 | 4246 |
| M1.1 | 18:26 | 18:39 | 18:47 | 4246 |
| C9.5 | 18:18 | 18:24 | 18:26 | 4246 |
| C2.9 | 18:05 | 18:09 | 18:14 | 4246 |
| M1.0 | 16:23 | 16:40 | 16:49 | 4246 |
| M1.2 | 08:47 | 08:58 | 09:08 | 4246 |
| M1.3 | 08:14 | 08:32 | 08:47 | 4246 |
| M1.0 | 06:22 | 06:32 | 06:36 | 4246 |
| M1.1 | 04:27 | 04:45 | 05:01 | 4246 |
| C6.1 | 04:02 | 04:06 | 04:17 | 4246 |
| C7.2 | 02:42 | 02:46 | 02:49 | 4246 |
| C6.5 | 02:30 | 02:37 | 02:42 | 4246 |
| C6.7 | 02:14 | 02:20 | 02:30 | 4246 |