FLUX ROPE FORMATION PRECEDING CORONAL MASS EJECTION ONSET
FLUX ROPE FORMATION PRECEDING CORONAL MASS EJECTION ONSET
We analyze the evolution of a sigmoidal (S-shaped) active region toward eruption, which includes a coronal mass ejection (CME) but leaves part of the filament in place. The X-ray sigmoid is found to trace out three different magnetic topologies in succession: a highly sheared arcade of coronal loops in its …