Solar flares on October 21, 2009
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 October 21, 2009
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 20, 2009 to October 21, 2009
Time zone — UTC+00 (Reykjavik)
List of solar flares for October 21, 2009
There were no solar flares on the selected date