Solar flares on December 21, 2001
The most powerful solar flare in 24 hours
C4.0 (normal) flare - December 21 at 12:21 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-05 (Kapuskasing)
List of solar flares for December 21, 2001
The total number of solar flares of class C and higher — 4 flares
C class — 4 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C3.5 | 16:30 | 16:52 | 17:16 | 9749 |
| C3.1 | 08:38 | 08:41 | 08:45 | 9742 |
| C3.1 | 05:03 | 05:08 | 05:13 | 9742 |
| C4.0 | 00:16 | 00:21 | 00:27 | 9742 |