Solar flares on April 21, 2026
The most powerful solar flare in 24 hours
C4.0 (normal) flare - April 21 at 3:50 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-08 (Anchorage) — summer time
List of solar flares for April 21, 2026
The total number of solar flares of class C and higher — 13 flares
C class — 13 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.2 | 22:23 | 22:26 | 22:28 | 4420 |
| C1.1 | 22:10 | 22:17 | 22:20 | 4420 |
| C1.4 | 20:22 | 20:33 | 20:40 | 4420 |
| C1.7 | 17:32 | 17:39 | 17:44 | 4420 |
| C1.1 | 15:13 | 15:20 | 15:25 | — |
| C1.9 | 13:20 | 13:25 | 13:37 | 4420 |
| C1.7 | 10:25 | 10:36 | 10:49 | 4420 |
| C1.4 | 08:29 | 08:43 | 08:56 | 4420 |
| C1.9 | 06:15 | 06:24 | 06:40 | 4420 |
| C1.4 | 05:41 | 06:02 | 06:12 | 4420 |
| C4.0 | 03:45 | 03:50 | 03:55 | 4420 |
| C2.2 | 03:25 | 03:30 | 03:42 | 4420 |
| C1.6 | 01:42 | 01:56 | 02:06 | 4420 |