Solar flares on October 21, 2025
The most powerful solar flare in 24 hours
C3.7 (normal) flare - October 21 at 12:19 PM
Solar activity index
Value as of the end of the day on October 21, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 20, 2025 to October 21, 2025
Time zone — UTC+05:30 (Kendraparha)
List of solar flares for October 21, 2025
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 |
|---|---|---|---|---|
| C3.7 | 12:06 | 12:19 | 12:29 | — |
| C1.3 | 11:24 | 11:30 | 11:35 | 4248 |
| C2.1 | 04:46 | 04:54 | 05:03 | 4248 |