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This is the first attempt to model the kinematics of a CME launch and theresulting EUV dimming quantitatively with a self-consistent model. Our 4D-modelassumes self-similar expansion of a spherical CME geometry that consists of aCME front with density compression and a cavity with density rarefaction,satisfying mass conservation of the total CME and swept-up corona. The modelcontains 14 free parameters and is fitted to the 2008 March 25 CME eventobserved with STEREO/A and B. Our model is able to reproduce the observed CMEexpansion and related EUV dimming during the initial phase from 18:30 UT to19:00 UT. The CME kinematics can be characterized by a constant acceleration(i.e., a constant magnetic driving force). While the observations of EUVI/A areconsistent with a spherical bubble geometry, we detect significant asymmetriesand density inhomogeneities with EUVI/B. This new forward-modeling methoddemonstrates how the observed EUV dimming can be used to model physicalparameters of the CME source region, the CME geometry, and CME kinematics.

4D Modeling of CME expansion and EUV dimming observed with STEREO/EUVI