Solar flares on February 21, 2002
The most powerful solar flare in 24 hours
M3.9 (strong) flare - February 21 at 12:26 PM
Solar activity index
Value as of the end of the day on February 21, 2002
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from February 20, 2002 to February 21, 2002
Time zone — UTC+00
List of solar flares for February 21, 2002
The total number of solar flares of class C and higher — 9 flares
C class — 6 | M class — 3 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.9 | 22:05 | 22:15 | 22:24 | — |
| M1.4 | 20:28 | 20:37 | 20:47 | — |
| M1.0 | 18:07 | 18:23 | 18:44 | — |
| C3.5 | 16:45 | 16:48 | 16:50 | 9830 |
| M3.9 | 11:56 | 12:26 | 12:36 | — |
| C7.0 | 09:25 | 09:32 | 09:57 | 9825 |
| C5.6 | 07:06 | 07:57 | 08:46 | — |
| C3.6 | 04:41 | 04:48 | 05:10 | 9825 |
| C5.7 | 00:45 | 00:54 | 01:27 | — |