Solar flares on October 17, 2025
The most powerful solar flare in 24 hours
M1.3 (strong) flare - October 17 at 9:58 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-09 (Honolulu) — 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 | 22:35 | 22:48 | 22:55 | 4246 |
| M1.3 | 21:49 | 21:58 | 22:04 | 4246 |
| M1.2 | 21:32 | 21:39 | 21:44 | 4246 |
| C9.9 | 20:43 | 21:05 | 21:19 | 4246 |
| M1.1 | 17:26 | 17:39 | 17:47 | 4246 |
| C9.5 | 17:18 | 17:24 | 17:26 | 4246 |
| C2.9 | 17:05 | 17:09 | 17:14 | 4246 |
| M1.0 | 15:23 | 15:40 | 15:49 | 4246 |
| M1.2 | 07:47 | 07:58 | 08:08 | 4246 |
| M1.3 | 07:14 | 07:32 | 07:47 | 4246 |
| M1.0 | 05:22 | 05:32 | 05:36 | 4246 |
| M1.1 | 03:27 | 03:45 | 04:01 | 4246 |
| C6.1 | 03:02 | 03:06 | 03:17 | 4246 |
| C7.2 | 01:42 | 01:46 | 01:49 | 4246 |
| C6.5 | 01:30 | 01:37 | 01:42 | 4246 |
| C6.7 | 01:14 | 01:20 | 01:30 | 4246 |