Solar flares on September 21, 2007
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 September 21, 2007
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from September 20, 2007 to September 21, 2007
Time zone — UTC+01 (London) — summer time
List of solar flares for September 21, 2007
There were no solar flares on the selected date