Solar flares on August 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 August 21, 2004
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from August 20, 2004 to August 21, 2004
Time zone — UTC+00
List of solar flares for August 21, 2004
There were no solar flares on the selected date