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

Abstract

This is the first attempt to model the kinematics of a CME launch and the resulting EUV dimming quantitatively with a self-consistent model. Our 4D-model assumes self-similar expansion of a spherical CME geometry that consists of a CME front with density compression and a cavity with density rarefaction, satisfying mass conservation of the total CME and swept-up corona. The model contains 14 free parameters and is fitted to the 2008 March 25 CME event observed with STEREO/A and B. Our model is able to reproduce the observed CME expansion and related EUV dimming during the initial phase from 18:30 UT to 19:00 UT. The CME kinematics can be characterized by a constant acceleration (i.e., a constant magnetic driving force). While the observations of EUVI/A are consistent with a spherical bubble geometry, we detect significant asymmetries and density inhomogeneities with EUVI/B. This new forward-modeling method demonstrates how the observed EUV dimming can be used to model physical parameters of the CME source region, the CME geometry, and CME kinematics.

12 pages, 6 Figures

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• No Trace Left Behind: Stereo Observation of a Coronal Mass Ejection without Low Coronal Signatures
• High cadence observations of a global coronal wave by EUVI/STEREO
• The kinematics of coronal mass ejections using multiscale methods
• Stereoscopy basics for the STEREO mission

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