Journal Article

PUBDB-2025-05714

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Temporal Properties of Compressible Magnetohydrodynamic Turbulence

Yuen, K. H. (Corresponding author)Extern* ; Li, H.Extern* ; Yan, H.DESY*

2025
IOP Publishing (for the American Astronomical Society) London

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Please use a persistent id in citations: doi:10.3847/1538-4357/add3ee

Abstract: Describing the temporal properties of compressible magnetohydrodynamic (MHD) turbulence is a fundamental problem that has important implications for particle acceleration and transport in astrophysical plasmas. Here, by carefully analyzing the spatial and temporal properties of compressible MHD turbulence, we derive a new spectral power density function that is supported by simulations. This new function reveals that the low-frequency fluctuations are dominated by modes with small parallel wavenumbers with respect to the mean background magnetic field. Furthermore, for fluctuations with dynamically significant parallel wavenumbers, broadening around their eigenfrequencies is described by this function, which is in close agreement with simulations. We use this formalism to present the scaling properties of individual MHD modes. Such broadening is a direct consequence of nonlinear processes and is different for the three fundamental MHD modes. Our results provide a new window to investigate the temporal properties of turbulence and will enable further studies on the interaction between compressible MHD turbulence and energetic plasmas.

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Contributing Institute(s):

1. Plasma-Astrophysik (Z_PLAS)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2025

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