Solar flares on April 20, 2002
The most powerful solar flare in 24 hours
X1.5 (very strong) flare - April 20 at 6:51 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-07 (Phoenix)
List of solar flares for April 20, 2002
The total number of solar flares of class C and higher — 8 flares
C class — 7 | M class — 0 | X class — 1
| Class | begin | max | end | region |
|---|---|---|---|---|
| X1.5 | 17:43 | 18:51 | 19:38 | 9906 |
| C1.9 | 16:23 | 16:26 | 16:28 | — |
| C2.5 | 12:44 | 13:14 | 13:35 | — |
| C2.2 | 10:34 | 10:48 | 11:10 | — |
| C4.1 | 08:38 | 08:48 | 09:01 | 9912 |
| C2.1 | 07:19 | 07:26 | 07:50 | — |
| C2.7 | 04:41 | 05:09 | 05:25 | — |
| C1.3 | 02:08 | 02:32 | 02:56 | — |