Solar flares on February 21, 2011
The most powerful solar flare in 24 hours
C7.8 (normal) flare - February 21 at 10:12 AM
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+00 (London)
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 | 18:25 | 18:35 | 18:47 | 1161 |
| C1.5 | 15:39 | 15:44 | 15:55 | 1158 |
| C7.8 | 10:08 | 10:12 | 10:15 | 1158 |
| C1.8 | 10:00 | 10:04 | 10:07 | 1158 |
| C2.7 | 09:01 | 09:06 | 09:09 | 1158 |
| C4.3 | 06:02 | 06:10 | 06:14 | — |
| C4.1 | 05:00 | 05:06 | 05:08 | 1158 |
| C1.5 | 04:04 | 04:10 | 04:13 | 1158 |
| C1.8 | 03:10 | 03:15 | 03:18 | 1158 |
| C4.6 | 02:13 | 02:24 | 02:27 | 1158 |