Solar flares on September 21, 2026
The most powerful solar flare in 24 hours
C1.2 (normal) flare - September 21 at 2:29 AM
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-04 (Dover) — summer time
List of solar flares for September 21, 2026
The total number of solar flares of class C and higher — 1 flare
C class — 1 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.2 | 02:21 | 02:29 | 02:35 | 4534 |