Solar flares on December 21, 2004
The most powerful solar flare in 24 hours
There were no solar flares on the selected date
Solar activity index
Value as of the end of the day on December 21, 2004
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from December 20, 2004 to December 21, 2004
Time zone — UTC-03:30 (Saint john's)
List of solar flares for December 21, 2004
There were no solar flares on the selected date