Solar flares on December 20, 2011
The most powerful solar flare in 24 hours
C2.9 (normal) flare - December 20 at 11:36 PM
Solar activity index
Value as of the end of the day on December 20, 2011
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 19, 2011 to December 20, 2011
Time zone — UTC+03 (Penza)
List of solar flares for December 20, 2011
The total number of solar flares of class C and higher — 4 flares
C class — 4 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C2.9 | 23:04 | 23:36 | 23:57 | 1376 |
| C1.4 | 21:17 | 21:21 | 21:28 | — |
| C2.1 | 14:47 | 14:52 | 14:54 | 1376 |
| C1.5 | 03:38 | 03:44 | 03:50 | 1381 |