M9.4 flare from 00:30 UT on September 24, 2013.
NASA's Goddard Space Flight Center/SDO
<a rel="nofollow" class="external free" href="http://svs.gsfc.nasa.gov/vis/a010000/a011300/a011383/">http://svs.gsfc.nasa.gov/vis/a010000/a011300/a011383/</a>