Solar flares on August 21, 2025
The most powerful solar flare in 24 hours
C3.2 (normal) flare - August 21 at 1:11 AM
Solar activity index
Value as of the end of the day on August 21, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from August 20, 2025 to August 21, 2025
Time zone — UTC+01 (London) — summer time
List of solar flares for August 21, 2025
The total number of solar flares of class C and higher — 5 flares
C class — 5 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.1 | 20:34 | 20:43 | 21:08 | 4191 |
| C2.3 | 16:46 | 16:56 | 17:03 | 4191 |
| C1.3 | 13:45 | 13:55 | 14:03 | 4191 |
| C1.7 | 03:21 | 03:32 | 03:40 | 4188 |
| C3.2 | 00:54 | 01:11 | 01:33 | 4191 |