Solar flares on April 21, 2026
The most powerful solar flare in 24 hours
C4.0 (normal) flare - April 21 at 4:50 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-07 (Olympia) — 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 | 23:23 | 23:26 | 23:28 | 4420 |
| C1.1 | 23:10 | 23:17 | 23:20 | 4420 |
| C1.4 | 21:22 | 21:33 | 21:40 | 4420 |
| C1.7 | 18:32 | 18:39 | 18:44 | 4420 |
| C1.1 | 16:13 | 16:20 | 16:25 | — |
| C1.9 | 14:20 | 14:25 | 14:37 | 4420 |
| C1.7 | 11:25 | 11:36 | 11:49 | 4420 |
| C1.4 | 09:29 | 09:43 | 09:56 | 4420 |
| C1.9 | 07:15 | 07:24 | 07:40 | 4420 |
| C1.4 | 06:41 | 07:02 | 07:12 | 4420 |
| C4.0 | 04:45 | 04:50 | 04:55 | 4420 |
| C2.2 | 04:25 | 04:30 | 04:42 | 4420 |
| C1.6 | 02:42 | 02:56 | 03:06 | 4420 |