Active Region 3213 rapidly emerged on the visible disk on February 6 as just a few sunspots but has since grown into a mature, magnetically-complex sunspot group, producing several M-class flares, including a double-peaked flare that began at 22:46 and peaked at 23:07 as M6.3. The first peak was registered as M3.8 at 22:58 UTC.
Click here for original story, Double-peaked M6.3 solar flare erupts from AR 3213
Source: Space Weather