Solar flares on April 21, 2001
The most powerful solar flare in 24 hours
C4.8 (normal) flare - April 21 at 6:48 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+02 (Monaco) — summer time
List of solar flares for April 21, 2001
The total number of solar flares of class C and higher — 4 flares
C class — 4 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.7 | 21:29 | 21:33 | 21:36 | 9433 |
| C1.7 | 20:05 | 20:09 | 20:12 | 9433 |
| C2.1 | 18:59 | 19:07 | 19:18 | — |
| C4.8 | 06:39 | 06:48 | 07:08 | — |