Solar flares on December 20, 2001
The most powerful solar flare in 24 hours
C5.0 (normal) flare - December 20 at 1:12 PM
Solar activity index
Value as of the end of the day on December 20, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 19, 2001 to December 20, 2001
Time zone — UTC-05 (Lansing)
List of solar flares for December 20, 2001
The total number of solar flares of class C and higher — 9 flares
C class — 9 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.9 | 22:55 | 23:06 | 23:11 | 9742 |
| C3.1 | 22:24 | 22:28 | 22:32 | 9742 |
| C3.7 | 19:48 | 19:53 | 19:59 | — |
| C3.5 | 19:23 | 19:29 | 19:39 | 9742 |
| C5.0 | 13:08 | 13:12 | 13:18 | 9742 |
| C2.7 | 12:10 | 12:15 | 12:24 | 9742 |
| C4.4 | 10:22 | 10:26 | 10:33 | 9742 |
| C2.4 | 06:03 | 06:06 | 06:12 | — |
| C3.1 | 03:44 | 03:47 | 03:50 | 9741 |