Greifswald 2024 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 7: Sun and Heliosphere II
EP 7.7: Talk
Thursday, February 29, 2024, 15:30–15:45, ELP 6: HS 2
Quasi-Discontinuous Solar Wind Models — •Lukas Westrich1,2, Horst Fichtner1, and Bidzina Shergelashvili1,2 — 1Ruhr-Universität Bochum, Institute for theoretical physics IV — 2Ilia State University, Faculty of Natural Sciences and Medicine, Tbilisi, Georgia
In this talk the heating of the solar wind above the Heliobase will be examined. Based on the discontinuous solar wind solutions from Shergelashvili et al. (2020) we developed new quasi-discontinuous solar wind models. First we will present the basic concept of discontinuous solar wind solutions and the quasi-discontinuous solar wind models, which is basically the assumption of a localized heating source above the Heliobase in a case of 1D quasi- adiabatic radial expansion of the solar wind. Furthermore, we will discuss the differences and the similarities of these. These models contain high gradients in the physical properties. Therefore, after an discussions of the characteristics of these solutions we will examine, how heat conduction could weaken those. It will be shown, that heat conduction is not strong enough to flatten the basic flow structure. As a result, the idea behind these models, that a damping of plasma waves near the trans-sonic point could produce such solar wind structures, is still reasonable.
Keywords: Solar Wind; Heat Conduction; Parker Solar Wind Solution; Method: Numerical HD-equations; Plasma Waves