München 2019 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 1: Sun and Heliosphere I

EP 1.2: Vortrag

Montag, 18. März 2019, 17:00–17:15, HS 19

Nonlinear magnetohydrostatic modeling of an active region based on SUNRISE/IMaX vector magnetogram — •Xiaoshuai Zhu and Thomas Wiegelmann — Max Planck Institute for Solar System Research, Goettingen, Germany

Nonlinear magnetohydrostatic (NLMHS) model is the better approximation of the physical state in the lower solar atmosphere than nonlinear force-free (NLFF) model. It is not just in magnetic field, it is also in terms of plasma distribution. In the test case, the NLMHS model has been able to meaningfully recover the plasma density and pressure. Here we present a first application of our new code to an active region (AR 11768) that was observed by IMaX polarimeter during the second flight of the balloon-borne SUNRISE solar observatory in 2013. Using the high spatial resolution IMaX vector magnetogram which is embedded in the HMI data to cover the total active region, we are able to model the non-force-free layer in the lower atmosphere. The strongly localized plasma distribution, electric current and Lorentz force in the result show that the NLMHS model has the important advantage of extrapolating the solar lower atmosphere than linear MHS and NLFF models.