Solar flares on April 21, 2015
The most powerful solar flare in 24 hours
M4.0 (strong) flare - April 21 at 10:45 AM
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-05 (Montgomery) — summer time
List of solar flares for April 21, 2015
The total number of solar flares of class C and higher — 15 flares
C class — 8 | M class — 7 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C4.1 | 22:14 | 22:25 | 22:34 | 2322 |
| C2.8 | 22:00 | 22:05 | 22:12 | 2333 |
| C4.6 | 21:00 | 21:07 | 21:15 | 2325 |
| C3.7 | 20:38 | 20:44 | 20:50 | 2324 |
| C2.3 | 20:11 | 20:15 | 20:19 | 2325 |
| M1.2 | 16:58 | 17:01 | 17:04 | 2325 |
| M1.8 | 16:39 | 16:45 | 16:55 | 2322 |
| C5.0 | 15:50 | 15:59 | 16:13 | 2325 |
| M2.1 | 11:55 | 12:00 | 12:09 | 2322 |
| M4.0 | 10:24 | 10:45 | 10:51 | 2322 |
| M2.2 | 06:49 | 06:57 | 07:02 | 2322 |
| M2.2 | 05:17 | 05:40 | 05:59 | — |
| C2.4 | 04:55 | 05:02 | 05:14 | 2322 |
| M1.0 | 02:08 | 02:21 | 02:27 | 2322 |
| C1.1 | 00:36 | 00:42 | 00:52 | 2324 |