Coronal dimmings and energetic CMEs in April-May 1998

We have analyzed the coronal dimmings for seven fast (> 600 km/s) coronal m ass ejections (CMEs) occurring between 23 April and 9 May which were associ ated with flares from NOAA active region (AR) 8210. Each of these CMEs had at least one group of interplanetary radio bursts associated with them. The se dimming regions were identified by their strong depletion in coronal EUV emission within a half hour of the estimated time of CME lift-off. They in cluded areas which were as dark as quiescent coronal holes as well as other regions with weaker brightness depletions. While the location of the activ e region and the associated flare did not correspond well with the coronagr aph observations, we found that the extended dimming areas in these events generally mapped out the apparent "footprint" of the CME as observed by whi te-light coronagraph. We briefly discuss the implications of these results on models of CME topology.