Solar flares on December 21, 2009
The most powerful solar flare in 24 hours
C2.5 (normal) flare - December 21 at 8:17 AM
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+01 (Zagreb)
List of solar flares for December 21, 2009
The total number of solar flares of class C and higher — 2 flares
C class — 2 | M class — 0 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C1.0 | 10:16 | 10:26 | 10:32 | — |
| C2.5 | 08:09 | 08:17 | 08:22 | — |