Solar flares on February 21, 2011
The most powerful solar flare in 24 hours
C7.8 (normal) flare - February 21 at 1:12 PM
Solar activity index
Value as of the end of the day on February 21, 2011
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from February 20, 2011 to February 21, 2011
Time zone — UTC+03 (Tula)
List of solar flares for February 21, 2011
The total number of solar flares of class C and higher — 10 flares
C class — 10 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.4 | 21:25 | 21:35 | 21:47 | 1161 |
| C1.5 | 18:39 | 18:44 | 18:55 | 1158 |
| C7.8 | 13:08 | 13:12 | 13:15 | 1158 |
| C1.8 | 13:00 | 13:04 | 13:07 | 1158 |
| C2.7 | 12:01 | 12:06 | 12:09 | 1158 |
| C4.3 | 09:02 | 09:10 | 09:14 | — |
| C4.1 | 08:00 | 08:06 | 08:08 | 1158 |
| C1.5 | 07:04 | 07:10 | 07:13 | 1158 |
| C1.8 | 06:10 | 06:15 | 06:18 | 1158 |
| C4.6 | 05:13 | 05:24 | 05:27 | 1158 |