Solar flares on April 20, 2002
The most powerful solar flare in 24 hours
C4.1 (normal) flare - April 20 at 3:48 PM
Solar activity index
Value as of the end of the day on April 20, 2002
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 19, 2002 to April 20, 2002
Time zone — UTC+00
List of solar flares for April 20, 2002
The total number of solar flares of class C and higher — 10 flares
C class — 10 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.9 | 23:23 | 23:26 | 23:28 | — |
| C2.5 | 19:44 | 20:14 | 20:35 | — |
| C2.2 | 17:34 | 17:48 | 18:10 | — |
| C4.1 | 15:38 | 15:48 | 16:01 | 9912 |
| C2.1 | 14:19 | 14:26 | 14:50 | — |
| C2.7 | 11:41 | 12:09 | 12:25 | — |
| C1.3 | 09:08 | 09:32 | 09:56 | — |
| C2.3 | 05:13 | 05:19 | 05:25 | — |
| C2.4 | 04:17 | 04:28 | 04:46 | — |
| C1.7 | 00:45 | 00:55 | 01:10 | — |