Solar flares on February 21, 2011
The most powerful solar flare in 24 hours
C7.8 (normal) flare - February 21 at 12:12 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+02 (Riga)
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 | 20:25 | 20:35 | 20:47 | 1161 |
| C1.5 | 17:39 | 17:44 | 17:55 | 1158 |
| C7.8 | 12:08 | 12:12 | 12:15 | 1158 |
| C1.8 | 12:00 | 12:04 | 12:07 | 1158 |
| C2.7 | 11:01 | 11:06 | 11:09 | 1158 |
| C4.3 | 08:02 | 08:10 | 08:14 | — |
| C4.1 | 07:00 | 07:06 | 07:08 | 1158 |
| C1.5 | 06:04 | 06:10 | 06:13 | 1158 |
| C1.8 | 05:10 | 05:15 | 05:18 | 1158 |
| C4.6 | 04:13 | 04:24 | 04:27 | 1158 |