Göttingen 2025 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 10: Poster Session

EP 10.16: Poster

Donnerstag, 3. April 2025, 11:00–12:30, ZHG Foyer 1. OG

Non-thermal motions in the solar corona — •Arjun Kannan, Hardi Peter, Yajie Chen, and Damien Przybylski — Max Planck Institute for Solar System Research, 37077 Göttingen, Germany

Almost all spectra from the Solar atmosphere show a line width in excess of the pure thermal broadening. Extreme UV (EUV) emission lines are formed in the transition region and the corona under optically thin conditions. Hence, the non-thermal broadening of these lines is expected to be mainly due to non-resolved motions, e.g., waves or turbulence. However, observations show that non-thermal motions in the upper solar atmosphere do not depend on spatial resolution, hinting at a mechanism operating well below currently resolvable scales. So far, general 3D models have failed to reproduce the observed non-thermal motions. Our study aims to investigate the latest high-resolution 3D models of the quiescent Solar regions to see if, at sufficient resolution, these models match observations. We synthesize emission in the respective EUV line and calculate the spectra to derive a synthetic map of the non-thermal line width, which can then be compared to real observations. This will provide insights into the extent to which the current 3D MHD models represent the solar upper atmosphere. This proof is essential for the future inclusion of these models in interpreting the data from new complex coronal spectroscopic observations, particularly with the upcoming MUltislit Solar Explorer (MUSE).

Keywords: Non-thermal; Line width; Extreme UV; Corona; MHD model