Solar flares on April 21, 2002
The most powerful solar flare in 24 hours
C8.3 (normal) flare - April 21 at 2:06 PM
Solar activity index
Value as of the end of the day on April 21, 2002
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 20, 2002 to April 21, 2002
Time zone — UTC-04 (Lansing) — summer time
List of solar flares for April 21, 2002
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 |
|---|---|---|---|---|
| C3.5 | 20:56 | 21:07 | 21:20 | 9915 |
| C7.7 | 20:03 | 20:19 | 20:21 | 9906 |
| C3.4 | 17:51 | 17:56 | 17:58 | — |
| C2.9 | 16:11 | 16:16 | 16:18 | — |
| C8.3 | 13:37 | 14:06 | 14:24 | — |
| C7.9 | 13:25 | 13:30 | 13:33 | — |