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We report observations of a two-stage coronal dimming in an eruptive event ofa two-ribbon flare and a fast coronal mass ejection (CME). Weak gradual dimmingpersists for more than half an hour before the onset of the two-ribbon flareand the fast rise of the CME. It is followed by abrupt rapid dimming. Thetwo-stage dimming occurs in a pair of conjugate dimming regions adjacent to thetwo flare ribbons, and the flare onset marks the transition between the twostages of dimming. At the onset of the two-ribbon flare, transient brighteningsare also observed inside the dimming regions, before rapid dimming occurs atthe same places. These observations suggest that the CME structure, mostprobably anchored at the twin dimming regions, undergoes a slow rise before theflare onset, and its kinematic evolution has significantly changed at the onsetof flare reconnection. We explore diagnostics of the CME evolution in the earlyphase with analysis of the gradual dimming signatures prior to the CMEeruption.

Gradual Solar Coronal Dimming and Evolution of Coronal Mass Ejection in the Early Phase