Solar flares on August 21, 2011
The most powerful solar flare in 24 hours
C1.5 (normal) flare - August 21 at 9:40 AM
Solar activity index
Value as of the end of the day on August 21, 2011
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from August 20, 2011 to August 21, 2011
Time zone — UTC-09 (Honolulu) — summer time
List of solar flares for August 21, 2011
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 |
|---|---|---|---|---|
| C1.2 | 14:10 | 14:16 | 14:26 | 1272 |
| C1.5 | 09:15 | 09:40 | 09:46 | 1272 |