Solar flares on August 21, 2025
The most powerful solar flare in 24 hours
C2.3 (normal) flare - August 21 at 11:56 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-04 (Indianapolis) — summer time
List of solar flares for August 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 |
|---|---|---|---|---|
| C1.1 | 15:34 | 15:43 | 16:08 | 4191 |
| C2.3 | 11:46 | 11:56 | 12:03 | 4191 |
| C1.3 | 08:45 | 08:55 | 09:03 | 4191 |