Solar flares on October 18, 2025
The most powerful solar flare in 24 hours
M1.5 (strong) flare - October 18 at 6:51 AM
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-04 (Jacksonville) — summer time
List of solar flares for October 18, 2025
The total number of solar flares of class C and higher — 9 flares
C class — 5 | M class — 4 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.0 | 21:46 | 21:56 | 22:04 | 4246 |
| C8.0 | 17:40 | 17:54 | 18:01 | 4246 |
| C3.1 | 17:18 | 17:26 | 17:33 | 4246 |
| C3.0 | 13:32 | 13:37 | 13:51 | 4246 |
| M1.5 | 06:37 | 06:51 | 06:59 | 4246 |
| C6.0 | 03:35 | 03:48 | 03:55 | 4246 |
| M1.3 | 02:49 | 02:58 | 03:04 | 4246 |
| M1.2 | 02:32 | 02:39 | 02:44 | 4246 |
| C9.9 | 01:43 | 02:05 | 02:19 | 4246 |