Solar flares on April 21, 2000
The most powerful solar flare in 24 hours
C4.8 (normal) flare - April 21 at 1:58 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-04 (Hartford) — summer time
List of solar flares for April 21, 2000
The total number of solar flares of class C and higher — 11 flares
C class — 11 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.0 | 22:54 | 23:03 | 23:11 | 8963 |
| C2.0 | 19:17 | 19:37 | 19:55 | 8963 |
| C1.8 | 18:32 | 18:36 | 18:53 | 8955 |
| C1.9 | 17:42 | 17:47 | 18:06 | 8967 |
| C1.2 | 16:32 | 16:35 | 16:41 | 8963 |
| C1.8 | 15:10 | 15:25 | 15:36 | 8963 |
| C4.8 | 13:53 | 13:58 | 14:06 | — |
| C1.4 | 11:19 | 11:23 | 11:26 | 8963 |
| C1.2 | 11:07 | 11:09 | 11:11 | 8963 |
| C1.7 | 05:23 | 05:28 | 05:34 | 8963 |
| C1.7 | 01:15 | 01:29 | 01:44 | 8955 |