Solar flares on December 21, 2009
The most powerful solar flare in 24 hours
C7.2 (normal) flare - December 21 at 10:56 PM
Solar activity index
Value as of the end of the day on December 21, 2009
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 20, 2009 to December 21, 2009
Time zone — UTC-06 (Lincoln)
List of solar flares for December 21, 2009
The total number of solar flares of class C and higher — 3 flares
C class — 3 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C7.2 | 22:50 | 22:56 | 23:00 | 1036 |
| C1.0 | 03:16 | 03:26 | 03:32 | — |
| C2.5 | 01:09 | 01:17 | 01:22 | — |