Solar flares on April 21, 2013
The most powerful solar flare in 24 hours
C4.5 (normal) flare - April 21 at 11:39 AM
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-07 (Salem) — summer time
List of solar flares for April 21, 2013
The total number of solar flares of class C and higher — 9 flares
C class — 9 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.7 | 12:59 | 13:15 | 13:32 | 1723 |
| C4.5 | 11:35 | 11:39 | 11:42 | 1726 |
| C2.9 | 09:00 | 09:03 | 09:06 | 1726 |
| C2.2 | 07:16 | 07:20 | 07:23 | 1726 |
| C1.0 | 04:38 | 05:03 | 05:09 | 1726 |
| C1.0 | 03:52 | 03:55 | 03:57 | 1726 |
| C1.8 | 03:21 | 03:24 | 03:26 | 1726 |
| C2.5 | 02:20 | 02:23 | 02:27 | 1726 |
| C1.3 | 00:30 | 00:34 | 00:40 | 1726 |