Solar flares on December 21, 2011
The most powerful solar flare in 24 hours
C4.3 (normal) flare - December 21 at 4:55 AM
Solar activity index
Value as of the end of the day on December 21, 2011
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 20, 2011 to December 21, 2011
Time zone — UTC+00
List of solar flares for December 21, 2011
The total number of solar flares of class C and higher — 16 flares
C class — 16 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.0 | 22:37 | 22:43 | 22:47 | 1376 |
| C1.5 | 20:08 | 20:11 | 20:13 | 1376 |
| C1.7 | 19:03 | 19:06 | 19:09 | 1376 |
| C1.9 | 18:07 | 18:12 | 18:17 | 1376 |
| C2.5 | 15:25 | 15:28 | 15:30 | 1382 |
| C2.0 | 13:02 | 13:07 | 13:09 | 1384 |
| C1.3 | 12:31 | 12:35 | 12:37 | 1384 |
| C2.1 | 11:02 | 11:05 | 11:07 | 1384 |
| C2.5 | 10:34 | 10:38 | 10:41 | 1384 |
| C2.2 | 09:03 | 09:09 | 09:15 | 1382 |
| C3.9 | 07:35 | 07:40 | 07:43 | 1382 |
| C2.0 | 06:56 | 06:59 | 07:03 | 1384 |
| C3.6 | 06:22 | 06:27 | 06:33 | 1382 |
| C4.3 | 04:48 | 04:55 | 04:59 | 1382 |
| C3.1 | 02:57 | 03:12 | 03:16 | 1382 |
| C1.5 | 00:54 | 00:59 | 01:03 | 1376 |