Göttingen 2025 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 14: Astrophysics II

EP 14.2: Talk

Friday, April 4, 2025, 11:15–11:30, ZHG101

Spatio-temporal correlation in incompressible MHD turbulence — •Raquel Mäusle and Wolf-Christian Müller — Technische Universität Berlin, Berlin, Germany

Turbulent flows are ubiquitous on Earth and throughout the universe, playing an important role in many astrophysical plasmas. Three-dimensional magnetohydrodynamic (MHD) turbulence exhibits a direct energy cascade, driven by the nonlinear interaction of colliding Alfvén wave packets. Our aim is to study the temporal and spatial properties of the energy transfer process by computing the spatio-temporal correlation between turbulent fluctuations of various length scales. The fluctuations are measured in direct numerical simulations in the co-moving Quasi-Lagrangian reference frame, which eliminates the large-scale sweeping effect. The single-time correlation between fluctuations parallel and perpendicular to the local magnetic field gives insight into the shape of the turbulent structures, whereas the multi-time correlation allows a measurement of the time scales involved in the cross-scale energy transfer and the propagation of Alfvén wave packets. In both cases, our results show a strong indication of critical balance behavior.

Keywords: Turbulence; Magnetohydrodynamics; Correlation