Solar flares on April 21, 2011
The most powerful solar flare in 24 hours
C8.5 (normal) flare - April 21 at 3:18 PM
Solar activity index
Value as of the end of the day on April 21, 2011
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 20, 2011 to April 21, 2011
Time zone — UTC+05:30 (Ranchi)
List of solar flares for April 21, 2011
The total number of solar flares of class C and higher — 5 flares
C class — 5 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C4.9 | 20:07 | 20:21 | 20:30 | 1195 |
| C8.5 | 15:08 | 15:18 | 15:28 | 1195 |
| C1.0 | 14:01 | 14:08 | 14:20 | 1195 |
| C4.0 | 01:00 | 01:09 | 01:19 | 1195 |
| C1.5 | 23:08 | 00:06 | 00:36 | — |