Solar flares on April 21, 2000
The most powerful solar flare in 24 hours
C4.8 (normal) flare - April 21 at 5:58 PM
Solar activity index
Value as of the end of the day on April 21, 2000
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 20, 2000 to April 21, 2000
Time zone — UTC+00
List of solar flares for April 21, 2000
The total number of solar flares of class C and higher — 13 flares
C class — 13 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.0 | 23:17 | 23:37 | 23:55 | 8963 |
| C1.8 | 22:32 | 22:36 | 22:53 | 8955 |
| C1.9 | 21:42 | 21:47 | 22:06 | 8967 |
| C1.2 | 20:32 | 20:35 | 20:41 | 8963 |
| C1.8 | 19:10 | 19:25 | 19:36 | 8963 |
| C4.8 | 17:53 | 17:58 | 18:06 | — |
| C1.4 | 15:19 | 15:23 | 15:26 | 8963 |
| C1.2 | 15:07 | 15:09 | 15:11 | 8963 |
| C1.7 | 09:23 | 09:28 | 09:34 | 8963 |
| C1.7 | 05:15 | 05:29 | 05:44 | 8955 |
| C1.3 | 03:23 | 03:27 | 03:34 | — |
| C1.3 | 02:34 | 02:37 | 02:47 | — |
| C2.3 | 00:54 | 00:59 | 01:02 | 8963 |