Solar flares on April 21, 2001
The most powerful solar flare in 24 hours
C4.8 (normal) flare - April 21 at 12:48 AM
Solar activity index
Value as of the end of the day on April 21, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 20, 2001 to April 21, 2001
Time zone — UTC-04 (Quebec) — summer time
List of solar flares for April 21, 2001
The total number of solar flares of class C and higher — 8 flares
C class — 8 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.7 | 21:45 | 21:48 | 21:51 | 9433 |
| C1.8 | 21:29 | 21:33 | 21:41 | 9433 |
| C3.6 | 18:33 | 18:46 | 18:55 | 9433 |
| C3.3 | 18:03 | 18:07 | 18:11 | 9433 |
| C1.7 | 15:29 | 15:33 | 15:36 | 9433 |
| C1.7 | 14:05 | 14:09 | 14:12 | 9433 |
| C2.1 | 12:59 | 13:07 | 13:18 | — |
| C4.8 | 00:39 | 00:48 | 01:08 | — |