Comparison of 3D and 1D Coronal Loop Simulations and Their Implied Emissions

Details Comparison of 3D and 1D Coronal Loop Simulations and Their Implied Emissions Comparison of 3D and 1D Coronal Loop Simulations and Their Implied Emissions

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21630003m&link_type=abstract

American Astronomical Society, AAS Meeting #216, #300.03; Bulletin of the American Astronomical Society, Vol. 41, p.815

Physics

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Scientific paper

The thermal structure of coronal loops have been studied by numerous 1D simulations and a few 3D simulations. Each method has its advantages and disadvantages. 1D allows high resolution with a large number of grid points to resolve the steep transition region without consuming excessive computer time. However, it provides no information on the internal structure over the loop's cross section, and lacks 3D perspective when compared with observations. 3D simulations, however, are often handicapped by limited spatial resolution. We have demonstrated the formation of coronal loops first by 3D simulation over an active region. The loops appear to be thin with uniform cross section in EUV as observed, despite the cross section expansion of the underlying flux tube. Then, we extracted the field line that threads through the loop, and did a 1D high-resolution simulation. In this approach, we used the strength of each method to validate the results. More importantly, the computed EUV emissions from the loops must be compared with observations. In this case, only 3D simulations can provide the necessary line-of-sight-integration effects and allow us to view the loops from different perspectives. Our presentation will show a realistic 3D view of the loops over an active region in EUV.
Work supported by Heliospheric Physics Theory Program of NASA

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