Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 10: Poster Session I
P 10.33: Poster
Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Turbulence in Molecular Clouds - A laboratory for understanding waves in partially ionized media — •Christian Heppe1, Alexei Ivlev2, and Frank Jenko1 — 1IPP, Garching (DE) — 2MPE, Garching (DE)
Plasma in space are are found in a partially ionized state only. Thus, we need to consider the interaction between ionized and neutral gases. Since the coupling between both gases is modelled via collisions we expect, on scales smaller than their collision frequencies, the gases to increasingly decouple while on larger scales the gases to move in unison. This has immediate consequences for MHD waves in the medium requiring a deviation from a single-fluid treatment, i.e. two-fluid MHD (2FMHD). Although 2FMHD predicts "decoupling gaps" for MHD modes in which propagation is prohibited or strongly damped, simulations of 2FMHD turbulence do not show such a gap. This suggests that within the framework of ideal 2FMHD an as of yet unknown process that mediates energy through this gap is present. As Molecular Clouds (MCs) are of generally high interest in Astrophysics and Astronomy due to their role in star formation and Cosmic Ray (CR) propagation, while covering a vast variety of plasma conditions under turbulent conditions over a wide range of scales, they pose as an ideal "laboratory" to empirically improve current understanding of MHD waves in partially ionized media.
Keywords: MHD waves; Partially Ionized; ISM; Plasma