Solar flares on September 17, 2021
The most powerful solar flare in 24 hours
C3.5 (normal) flare - September 17 at 12:20 AM
Solar activity index
Value as of the end of the day on September 17, 2021
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 16, 2021 to September 17, 2021
Time zone — UTC-04 (Augusta) — summer time
List of solar flares for September 17, 2021
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 |
|---|---|---|---|---|
| C3.5 | 00:09 | 00:20 | 00:48 | 2871 |