If sunspot 1678 had still been Earth facing at the time of this flare, this flare would have more than likely registered in the high M range.
CHANCE OF FLARES: New sunspot AR1678 has developed a delta-class magnetic field that harbors energy for strong explosions. NOAA forecasters estimate a 55% chance of M-flares and a 15% chance of X-flares during the next 24 hours
FARSIDE HOTSPOT: As big sunspot AR1678 departs, another active region is approaching. NASA's STEREO-B probe, stationed over the farside of the sun, is monitoring a significant ultraviolet hotspot. It is circled in this 360-degree Stoneyhurst projection of the entire solar surface:
This is the same sunspot region MSA has been watching all week. looks like we may be in for some solar action soon
Click HERE to read the MSA report on this approaching sunspot region