#SolarFlares, or bursts of #radiation, are ranked on a scale that goes from A, B & C to M & X, in increasing order of intensity. They usually originate from #sunspots, or bruiselike discolorations on the surface of the #sun.
Sunspots are most common near the height of the 11-year #solar cycle. The current cycle, number 25, is expected to reach its peak this year. The more sunspots, the more opportunities for solar flares.