Solar flares on December 28, 2011
The most powerful solar flare in 24 hours
C7.2 (normal) flare - December 28 at 2:25 PM
Solar activity index
Value as of the end of the day on December 28, 2011
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 27, 2011 to December 28, 2011
Time zone — UTC+00 (London)
List of solar flares for December 28, 2011
The total number of solar flares of class C and higher — 13 flares
C class — 13 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C6.2 | 21:21 | 21:29 | 21:36 | 1389 |
| C2.3 | 20:53 | 21:07 | 21:10 | 1384 |
| C4.0 | 20:18 | 20:31 | 20:40 | 1386 |
| C1.3 | 19:46 | 19:51 | 19:55 | — |
| C6.4 | 16:36 | 16:40 | 16:44 | 1387 |
| C3.1 | 16:03 | 16:10 | 16:25 | — |
| C7.2 | 14:17 | 14:25 | 14:28 | 1389 |
| C2.0 | 13:05 | 13:10 | 13:16 | — |
| C1.1 | 11:49 | 11:53 | 11:57 | — |
| C2.6 | 05:19 | 05:28 | 05:35 | 1389 |
| C4.5 | 03:30 | 03:50 | 04:10 | 1389 |
| C2.1 | 01:54 | 02:08 | 02:16 | 1389 |
| C2.3 | 00:14 | 00:30 | 00:40 | 1387 |