Solar flares on April 21, 2001
The most powerful solar flare in 24 hours
C4.8 (normal) flare - April 21 at 4:48 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+00
List of solar flares for April 21, 2001
The total number of solar flares of class C and higher — 6 flares
C class — 6 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.6 | 22:33 | 22:46 | 22:55 | 9433 |
| C3.3 | 22:03 | 22:07 | 22:11 | 9433 |
| C1.7 | 19:29 | 19:33 | 19:36 | 9433 |
| C1.7 | 18:05 | 18:09 | 18:12 | 9433 |
| C2.1 | 16:59 | 17:07 | 17:18 | — |
| C4.8 | 04:39 | 04:48 | 05:08 | — |