Solar flares on April 21, 2013
The most powerful solar flare in 24 hours
C4.5 (normal) flare - April 21 at 9:39 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+03 (Cherepovets)
List of solar flares for April 21, 2013
The total number of solar flares of class C and higher — 16 flares
C class — 16 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.7 | 22:59 | 23:15 | 23:32 | 1723 |
| C4.5 | 21:35 | 21:39 | 21:42 | 1726 |
| C2.9 | 19:00 | 19:03 | 19:06 | 1726 |
| C2.2 | 17:16 | 17:20 | 17:23 | 1726 |
| C1.0 | 14:38 | 15:03 | 15:09 | 1726 |
| C1.0 | 13:52 | 13:55 | 13:57 | 1726 |
| C1.8 | 13:21 | 13:24 | 13:26 | 1726 |
| C2.5 | 12:20 | 12:23 | 12:27 | 1726 |
| C1.3 | 10:30 | 10:34 | 10:40 | 1726 |
| C2.7 | 08:57 | 09:00 | 09:02 | 1726 |
| C1.4 | 08:04 | 08:14 | 08:18 | 1726 |
| C1.0 | 05:56 | 06:00 | 06:02 | 1726 |
| C3.6 | 04:02 | 04:09 | 04:16 | 1726 |
| C1.3 | 01:46 | 01:52 | 01:59 | 1726 |
| C1.1 | 01:24 | 01:29 | 01:33 | 1726 |
| C1.1 | 01:09 | 01:13 | 01:18 | 1726 |