Solar flares on April 21, 2015
The most powerful solar flare in 24 hours
M4.0 (strong) flare - April 21 at 4:45 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+01 (London) — summer time
List of solar flares for April 21, 2015
The total number of solar flares of class C and higher — 11 flares
C class — 4 | M class — 7 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.2 | 22:58 | 23:01 | 23:04 | 2325 |
| M1.8 | 22:39 | 22:45 | 22:55 | 2322 |
| C5.0 | 21:50 | 21:59 | 22:13 | 2325 |
| M2.1 | 17:55 | 18:00 | 18:09 | 2322 |
| M4.0 | 16:24 | 16:45 | 16:51 | 2322 |
| M2.2 | 12:49 | 12:57 | 13:02 | 2322 |
| M2.2 | 11:17 | 11:40 | 11:59 | — |
| C2.4 | 10:55 | 11:02 | 11:14 | 2322 |
| M1.0 | 08:08 | 08:21 | 08:27 | 2322 |
| C1.1 | 06:36 | 06:42 | 06:52 | 2324 |
| C1.2 | 04:49 | 04:54 | 05:07 | 2322 |