Solar flares on December 21, 2011
The most powerful solar flare in 24 hours
C5.4 (normal) flare - December 21 at 6:08 PM
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-08 (Carson City)
List of solar flares for December 21, 2011
The total number of solar flares of class C and higher — 11 flares
C class — 11 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C5.4 | 17:56 | 18:08 | 18:20 | 1381 |
| C2.0 | 14:37 | 14:43 | 14:47 | 1376 |
| C1.5 | 12:08 | 12:11 | 12:13 | 1376 |
| C1.7 | 11:03 | 11:06 | 11:09 | 1376 |
| C1.9 | 10:07 | 10:12 | 10:17 | 1376 |
| C2.5 | 07:25 | 07:28 | 07:30 | 1382 |
| C2.0 | 05:02 | 05:07 | 05:09 | 1384 |
| C1.3 | 04:31 | 04:35 | 04:37 | 1384 |
| C2.1 | 03:02 | 03:05 | 03:07 | 1384 |
| C2.5 | 02:34 | 02:38 | 02:41 | 1384 |
| C2.2 | 01:03 | 01:09 | 01:15 | 1382 |