Solar flares on September 21, 2026
The most powerful solar flare in 24 hours
C2.0 (normal) flare - September 21 at 10:51 PM
Solar activity index
Value as of the end of the day on September 21, 2026
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 20, 2026 to September 21, 2026
Time zone — UTC-06 (Fort Smith) — summer time
List of solar flares for September 21, 2026
The total number of solar flares of class C and higher — 2 flares
C class — 2 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.0 | 22:31 | 22:51 | 23:01 | — |
| C1.2 | 00:21 | 00:29 | 00:35 | 4534 |