Solar flares on September 18, 2021
The most powerful solar flare in 24 hours
C2.6 (normal) flare - September 18 at 12:27 AM
Solar activity index
Value as of the end of the day on September 18, 2021
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 17, 2021 to September 18, 2021
Time zone — UTC-08 (Dillingham) — summer time
List of solar flares for September 18, 2021
The total number of solar flares of class C and higher — 3 flares
C class — 3 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.6 | 17:04 | 17:15 | 17:22 | 2871 |
| C2.6 | 23:47 | 00:27 | 00:33 | 2871 |
| C1.6 | 23:48 | 00:15 | 15:48 | 2871 |