Solar flares on April 21, 2015
The most powerful solar flare in 24 hours
M4.0 (strong) flare - April 21 at 6:45 PM
Solar activity index
Value as of the end of the day on April 21, 2015
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 20, 2015 to April 21, 2015
Time zone — UTC+03 (Vladimir)
List of solar flares for April 21, 2015
The total number of solar flares of class C and higher — 10 flares
C class — 5 | M class — 5 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C5.0 | 23:50 | 23:59 | 00:13 | 2325 |
| M2.1 | 19:55 | 20:00 | 20:09 | 2322 |
| M4.0 | 18:24 | 18:45 | 18:51 | 2322 |
| M2.2 | 14:49 | 14:57 | 15:02 | 2322 |
| M2.2 | 13:17 | 13:40 | 13:59 | — |
| C2.4 | 12:55 | 13:02 | 13:14 | 2322 |
| M1.0 | 10:08 | 10:21 | 10:27 | 2322 |
| C1.1 | 08:36 | 08:42 | 08:52 | 2324 |
| C1.2 | 06:49 | 06:54 | 07:07 | 2322 |
| C2.4 | 23:40 | 00:16 | 01:15 | 2321 |