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4D-Modeling of CME Expansion and EUV Dimming Observed with STEREO/EUVI View all abstracts by submitter

Markus J. Aschwanden   Submitted: 2009-06-08 11:24

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 12 free parameters and is fitted to the 2008 March 25, 18:30 UT, CME event observed with STEREO/A and B. Our model is able 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.

Authors: Markus J. Aschwanden
Projects: STEREO

Publication Status: Annales Geophysicae (accepted 2009-Aug-13, in press)
Last Modified: 2009-08-13 08:38
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