Solar flares on April 21, 2026
The most powerful solar flare in 24 hours
C5.3 (normal) flare - April 21 at 6:02 AM
Solar activity index
Value as of the end of the day on April 21, 2026
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 20, 2026 to April 21, 2026
Time zone — UTC+00
List of solar flares for April 21, 2026
The total number of solar flares of class C and higher — 12 flares
C class — 12 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.1 | 23:13 | 23:20 | 23:25 | — |
| C1.9 | 21:20 | 21:25 | 21:37 | 4420 |
| C1.7 | 18:25 | 18:36 | 18:49 | 4420 |
| C1.4 | 16:29 | 16:43 | 16:56 | 4420 |
| C1.9 | 14:15 | 14:24 | 14:40 | 4420 |
| C1.4 | 13:41 | 14:02 | 14:12 | 4420 |
| C4.0 | 11:45 | 11:50 | 11:55 | 4420 |
| C2.2 | 11:25 | 11:30 | 11:42 | 4420 |
| C1.6 | 09:42 | 09:56 | 10:06 | 4420 |
| C1.4 | 06:47 | 06:55 | 07:00 | 4420 |
| C5.3 | 05:53 | 06:02 | 06:08 | 4421 |
| C1.3 | 01:03 | 01:15 | 01:24 | — |