Realistic MHD Modeling of EUV Waves: Insight From a Coupled Observational and Modeling Analysis

Details Realistic MHD Modeling of EUV Waves: Insight From a Coupled Observational and Modeling Analysis Realistic MHD Modeling of EUV Waves: Insight From a Coupled Observational and Modeling Analysis

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh43a1939d&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH43A-1939

Astronomy and Astrophysics

Astrophysics

[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7549] Solar Physics, Astrophysics, And Astronomy / Ultraviolet Emissions

Scientific paper

With the advent of modern computational tools it is now becoming the norm to employ detailed 3D computer models as empirical tools that directly account for the inhomogeneous nature of the Sun-Heliosphere environment. They key advantage of this approach is the ability to compare model results directly to observational data. Using EUV waves as the scientific driver, we show how the coupled analysis of observations and realistic model results can provide deep insight into the underlying physical nature of this phenomena. We motivate the discussion by overviewing the critical model development steps necessary to provide a realistic 3D thermodynamic and magnetic background in the low corona, as well as the important validation step of synthesizing observables for direct comparison to EUV imaging data. Once this link is established it becomes possible to use the model as an effective laboratory to test the plausibility of various physical scenarios for EUV waves (e.g. fast-mode wave, expanding current shell, reconnection front, non-linear modes, etc.) in not only their natural environment but one where the underlying 3D distribution of fundamental plasma parameters are known. Our latest effort involves a coupled modeling and observational analysis of the 2010 June 13 EUV wave observed by the AIA imager aboard the Solar Dynamics Observatory. With a model eruption that compares favorably with the observations, we focus on two main aspects: (a) the interpretation of the stark, unambiguous thermodynamic signatures in the multi-filter AIA data within the propagating EUV wave front. And (b) an in depth analysis of the time-dependent 3D simulation results and their implication with respect to EUV wave theories. Multiple aspects, including the relative phases of perturbed variables, suggest that the outer, propagating component of the EUV wave exhibits the characteristic behavior of a fast-mode wave. Additionally we find that this component becomes decoupled from the evolving structures associated with the Coronal Mass Ejection that are also visible, lending robust theoretical support to recent observational studies.

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