Solar flares on October 20, 2025
The most powerful solar flare in 24 hours
M1.0 (strong) flare - October 20 at 7:27 AM
Solar activity index
Value as of the end of the day on October 20, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 19, 2025 to October 20, 2025
Time zone — UTC+02 (Madrid) — summer time
List of solar flares for October 20, 2025
The total number of solar flares of class C and higher — 6 flares
C class — 5 | M class — 1 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.0 | 17:14 | 17:45 | 18:23 | 4257 |
| C2.6 | 11:47 | 11:55 | 11:59 | 4248 |
| C3.5 | 09:39 | 09:48 | 10:20 | 4248 |
| M1.0 | 07:10 | 07:27 | 07:38 | 4248 |
| C5.9 | 04:24 | 04:34 | 04:47 | 4246 |
| C3.0 | 00:44 | 00:52 | 01:06 | — |