Solar flares on October 18, 2025
The most powerful solar flare in 24 hours
M1.5 (strong) flare - October 18 at 12:51 PM
Solar activity index
Value as of the end of the day on October 18, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 17, 2025 to October 18, 2025
Time zone — UTC+02 (Vienna) — summer time
List of solar flares for October 18, 2025
The total number of solar flares of class C and higher — 12 flares
C class — 7 | M class — 5 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C8.0 | 23:40 | 23:54 | 00:01 | 4246 |
| C3.1 | 23:18 | 23:26 | 23:33 | 4246 |
| C3.0 | 19:32 | 19:37 | 19:51 | 4246 |
| M1.5 | 12:37 | 12:51 | 12:59 | 4246 |
| C6.0 | 09:35 | 09:48 | 09:55 | 4246 |
| M1.3 | 08:49 | 08:58 | 09:04 | 4246 |
| M1.2 | 08:32 | 08:39 | 08:44 | 4246 |
| C9.9 | 07:43 | 08:05 | 08:19 | 4246 |
| M1.1 | 04:26 | 04:39 | 04:47 | 4246 |
| C9.5 | 04:18 | 04:24 | 04:26 | 4246 |
| C2.9 | 04:05 | 04:09 | 04:14 | 4246 |
| M1.0 | 02:23 | 02:40 | 02:49 | 4246 |