Spectral analysis of 3D MHD models of coronal structures

Details Spectral analysis of 3D MHD models of coronal structures Spectral analysis of 3D MHD models of coronal structures

2009-04-15

arxiv.org/abs/0904.2312v1

Advances in Space Research 43 (2009), pp. 1451-1456

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 3 figures

Scientific paper

10.1016/j.asr.2009.01.033

We study extreme-ultraviolet emission line spectra derived from three-dimensional magnetohydrodynamic models of structures in the corona. In order to investigate the effects of increased magnetic activity at photospheric levels in a numerical experiment, a much higher magnetic flux density is applied at photospheric levels as compared to the Sun. Thus, we can expect our results to highlight the differences between the Sun and more active, but still solar-like stars. We discuss signatures seen in extreme-ultraviolet emission lines synthesized from these models and compare them to signatures found in the spatial distribution and temporal evolution of Doppler shifts in lines formed in the transition region and corona. This is of major interest to test the quality of the underlying magnetohydrodynamic model to heat the corona, i.e. currents in the corona driven by photospheric motions (flux braiding).

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