Solar flares on December 21, 2001
The most powerful solar flare in 24 hours
C4.0 (normal) flare - December 21 at 5:21 AM
Solar activity index
Value as of the end of the day on December 21, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 20, 2001 to December 21, 2001
Time zone — UTC+00
List of solar flares for December 21, 2001
The total number of solar flares of class C and higher — 8 flares
C class — 8 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.5 | 21:30 | 21:52 | 22:16 | 9749 |
| C3.1 | 13:38 | 13:41 | 13:45 | 9742 |
| C3.1 | 10:03 | 10:08 | 10:13 | 9742 |
| C4.0 | 05:16 | 05:21 | 05:27 | 9742 |
| C2.9 | 03:55 | 04:06 | 04:11 | 9742 |
| C3.1 | 03:24 | 03:28 | 03:32 | 9742 |
| C3.7 | 00:48 | 00:53 | 00:59 | — |
| C3.5 | 00:23 | 00:29 | 00:39 | 9742 |