Solar flares on December 21, 2001
The most powerful solar flare in 24 hours
C4.0 (normal) flare - December 21 at 7:21 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+02 (Bucharest)
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 | 23:30 | 23:52 | 00:16 | 9749 |
| C3.1 | 15:38 | 15:41 | 15:45 | 9742 |
| C3.1 | 12:03 | 12:08 | 12:13 | 9742 |
| C4.0 | 07:16 | 07:21 | 07:27 | 9742 |
| C2.9 | 05:55 | 06:06 | 06:11 | 9742 |
| C3.1 | 05:24 | 05:28 | 05:32 | 9742 |
| C3.7 | 02:48 | 02:53 | 02:59 | — |
| C3.5 | 02:23 | 02:29 | 02:39 | 9742 |