Solar flares on August 21, 2017
The most powerful solar flare in 24 hours
C5.9 (normal) flare - August 21 at 3:16 AM
Solar activity index
Value as of the end of the day on August 21, 2017
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from August 20, 2017 to August 21, 2017
Time zone — UTC+00
List of solar flares for August 21, 2017
The total number of solar flares of class C and higher — 4 flares
C class — 4 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.5 | 21:47 | 22:38 | 22:58 | 2671 |
| C1.5 | 20:12 | 20:22 | 20:26 | 2671 |
| C3.0 | 17:39 | 17:57 | 18:01 | — |
| C5.9 | 03:05 | 03:16 | 03:30 | 2672 |