First X-class solar flare of Solar Cycle 24 – X2.3 on February 14, 2011
Earth-orbiting satellites detected an X2.3 solar flare at 01:56 UTC on February 14, 2011. This is the most powerful solar flare in nearly five years, and the first X-class solar flare of Solar Cycle 24. The source was behemoth sunspot 1158.
Solar
