4-D modeling of CME expansion and EUV dimming observed with STEREO/EUVI
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 4-D-model assumes self-similar expansion of a spherical CME geometry that consists of a CME front with density compression and a cavity with density ra...
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2009-08-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/27/3275/2009/angeo-27-3275-2009.pdf |
| Summary: | 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 4-D-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 25 March 2008 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. |
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| ISSN: | 0992-7689 1432-0576 |