Solar flares on October 21, 2026
The most powerful solar flare in 24 hours
C2.1 (normal) flare - October 21 at 10:52 PM
Solar activity index
Value as of the end of the day on October 21, 2026
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 20, 2026 to October 21, 2026
Time zone — UTC+00
List of solar flares for October 21, 2026
The total number of solar flares of class C and higher — 3 flares
C class — 3 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.1 | 22:44 | 22:52 | 22:56 | 4560 |
| C1.4 | 21:08 | 21:19 | 21:31 | 4560 |
| C1.3 | 10:51 | 10:58 | 11:03 | 4551 |