Solar flares on October 17, 2025
The most powerful solar flare in 24 hours
M1.5 (strong) flare - October 17 at 3:28 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+02 (Zagreb) — summer time
List of solar flares for October 17, 2025
The total number of solar flares of class C and higher — 12 flares
C class — 6 | M class — 6 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.2 | 18:47 | 18:58 | 19:08 | 4246 |
| M1.3 | 18:14 | 18:32 | 18:47 | 4246 |
| M1.0 | 16:22 | 16:32 | 16:36 | 4246 |
| M1.1 | 14:27 | 14:45 | 15:01 | 4246 |
| C6.1 | 14:02 | 14:06 | 14:17 | 4246 |
| C7.2 | 12:42 | 12:46 | 12:49 | 4246 |
| C6.5 | 12:30 | 12:37 | 12:42 | 4246 |
| C6.7 | 12:14 | 12:20 | 12:30 | 4246 |
| C8.0 | 07:48 | 07:54 | 07:57 | 4248 |
| M1.5 | 03:15 | 03:28 | 03:40 | 4246 |
| M1.0 | 01:12 | 01:19 | 01:28 | 4246 |
| C5.5 | 00:38 | 00:54 | 01:02 | 4246 |