Solar flares on April 21, 2013
The most powerful solar flare in 24 hours
C4.5 (normal) flare - April 21 at 1:39 PM
Solar activity index
Value as of the end of the day on April 21, 2013
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 20, 2013 to April 21, 2013
Time zone — UTC-05 (Lincoln) — summer time
List of solar flares for April 21, 2013
The total number of solar flares of class C and higher — 11 flares
C class — 11 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.7 | 14:59 | 15:15 | 15:32 | 1723 |
| C4.5 | 13:35 | 13:39 | 13:42 | 1726 |
| C2.9 | 11:00 | 11:03 | 11:06 | 1726 |
| C2.2 | 09:16 | 09:20 | 09:23 | 1726 |
| C1.0 | 06:38 | 07:03 | 07:09 | 1726 |
| C1.0 | 05:52 | 05:55 | 05:57 | 1726 |
| C1.8 | 05:21 | 05:24 | 05:26 | 1726 |
| C2.5 | 04:20 | 04:23 | 04:27 | 1726 |
| C1.3 | 02:30 | 02:34 | 02:40 | 1726 |
| C2.7 | 00:57 | 01:00 | 01:02 | 1726 |
| C1.4 | 00:04 | 00:14 | 00:18 | 1726 |