Greifswald 2024 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Poster II
P 12.30: Poster
Dienstag, 27. Februar 2024, 16:30–18:30, ELP 6: Foyer
Turbulence in Molecular Clouds — •Christian Heppe1, Alexei Ivlev2, and Frank Jenko1 — 1Max-Planck-Institut für Plasmaphysik — 2Max-Planck-Institut für extraterrestrische Physik
In the Interstellar Medium a vast array of different plasma can be observed. Ranging from the almost fully ionized low density plasma in between stars to the cold, dense gas in Molecular clouds where ionization is solely governed by the presence of high energy cosmic rays. Where either magnetic or thermal pressure can dominate. In these environments the dynamics of the medium are governed by turbulence.
As the coupling between neutral and ionized gas can strongly vary in such inhomogeneous environments two fluid effects become necessary to account for. The coupling of the neutral and ionized gas is mediated by collisions and current theory suggests that one can identify three coupling regimes. At large scales, in the strongly coupled regime, the ionized and neutral gas move together as one fluid. Beyond this, in the weakly coupled regime, the dynamics of both species begin to decouple. Finally, in the decoupled regime at even smaller scales, both gases move independent of each other. Despite this, the current models lack physical insight and yield qualitative results that do not match relevant simulations.
By systematically probing different turbulent environments with two fluid MHD simulations we hope to find a phenomenological explanation as to how the turbulent cascade manages to bridge the decoupling regime and transport energy to smaller scales, possibly identifying an elementary turbulent interaction.
Keywords: Turbulence; two fluid MHD; Molecular Clouds; ISM; Simulations