Solar flares on April 21, 2025
The most powerful solar flare in 24 hours
C4.3 (normal) flare - April 21 at 1:18 AM
Solar activity index
Value as of the end of the day on April 21, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 20, 2025 to April 21, 2025
Time zone — UTC+08 (Ulan-Ude)
List of solar flares for April 21, 2025
The total number of solar flares of class C and higher — 4 flares
C class — 4 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.1 | 14:31 | 14:42 | 14:51 | 4063 |
| C3.9 | 08:10 | 08:31 | 08:54 | 4064 |
| C4.3 | 01:02 | 01:18 | 01:34 | 4063 |
| C1.7 | 00:23 | 00:28 | 00:33 | 4064 |