Solar flares on December 21, 2011
The most powerful solar flare in 24 hours
C6.2 (normal) flare - December 21 at 1:50 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+03 (Tula)
List of solar flares for December 21, 2011
The total number of solar flares of class C and higher — 17 flares
C class — 17 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.5 | 23:08 | 23:11 | 23:13 | 1376 |
| C1.7 | 22:03 | 22:06 | 22:09 | 1376 |
| C1.9 | 21:07 | 21:12 | 21:17 | 1376 |
| C2.5 | 18:25 | 18:28 | 18:30 | 1382 |
| C2.0 | 16:02 | 16:07 | 16:09 | 1384 |
| C1.3 | 15:31 | 15:35 | 15:37 | 1384 |
| C2.1 | 14:02 | 14:05 | 14:07 | 1384 |
| C2.5 | 13:34 | 13:38 | 13:41 | 1384 |
| C2.2 | 12:03 | 12:09 | 12:15 | 1382 |
| C3.9 | 10:35 | 10:40 | 10:43 | 1382 |
| C2.0 | 09:56 | 09:59 | 10:03 | 1384 |
| C3.6 | 09:22 | 09:27 | 09:33 | 1382 |
| C4.3 | 07:48 | 07:55 | 07:59 | 1382 |
| C3.1 | 05:57 | 06:12 | 06:16 | 1382 |
| C1.5 | 03:54 | 03:59 | 04:03 | 1376 |
| C6.2 | 01:38 | 01:50 | 02:04 | 1376 |
| C2.3 | 00:55 | 01:02 | 01:06 | — |