SPA-GRL Issue Highlights

Active regions in the sun can give rise to coronal mass ejections (CMEs). Glover et al. use white light, extreme ultraviolet and H-alpha data to extend the findings of previous investigations into the connection between sigma-to-arcade development and CME launch. By applying these new criteria, they reclassify the previous "sigmoidal" cases as sigmoidal, nonsigmoidal, and active regions that appear sigmoidal due to the projection of many loops. They confirm that S (or inverse S) shaped active regions are more frequently associated with a CME than are the nonsigmoidal structures.