Solar flares on February 21, 2011
The most powerful solar flare in 24 hours
C7.8 (normal) flare - February 21 at 5:12 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-05 (Columbus)
List of solar flares for February 21, 2011
The total number of solar flares of class C and higher — 7 flares
C class — 7 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.4 | 13:25 | 13:35 | 13:47 | 1161 |
| C1.5 | 10:39 | 10:44 | 10:55 | 1158 |
| C7.8 | 05:08 | 05:12 | 05:15 | 1158 |
| C1.8 | 05:00 | 05:04 | 05:07 | 1158 |
| C2.7 | 04:01 | 04:06 | 04:09 | 1158 |
| C4.3 | 01:02 | 01:10 | 01:14 | — |
| C4.1 | 00:00 | 00:06 | 00:08 | 1158 |