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Generalized phase mixing: Turbulence-like behaviour from unidirectionally propagating MHD waves.

Norbert Magyar1, Tom Van Doorsselaere2, Marcel Goossens2

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Three-dimensional magnetohydrodynamics (MHD) simulations reveal that generalizing phase mixing with Alfvénic waves generates turbulence-like behavior and complex current sheets in plasma. This finding relaxes conditions for astrophysical turbulence generation, particularly in coronal holes.

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Area of Science:

  • Plasma Physics
  • Astrophysics
  • Solar Physics

Background:

  • Alfvénic waves are fundamental to plasma dynamics.
  • Phase mixing is a known mechanism for energy dissipation in plasmas.
  • Previous studies focused on simpler, 2D, or longitudinally homogeneous scenarios.

Purpose of the Study:

  • To investigate the effects of perpendicularly inhomogeneous plasma on Alfvénic wave dynamics using 3D ideal magnetohydrodynamics (MHD).
  • To explore phenomena beyond traditional phase mixing by generalizing the scenario.
  • To understand the generation of turbulence-like behavior and complex current structures.

Main Methods:

  • Three-dimensional (3D) ideal magnetohydrodynamics (MHD) simulations.
  • Numerical modeling of plasma dynamics.
  • Analysis of wave propagation and energy dissipation in inhomogeneous media.

Main Results:

  • Generalizing phase mixing in 3D MHD simulations leads to turbulence-like behavior.
  • Complex current-sheet structures are formed, even in longitudinally homogeneous plasma.
  • Novel phenomena arise from unidirectionally propagating waves in perpendicularly inhomogeneous plasma.

Conclusions:

  • The study demonstrates a novel pathway to astrophysical turbulence generation.
  • Findings are relevant to understanding plasma dynamics in coronal holes and beyond.
  • The results relax previously assumed conditions for turbulent behavior in plasmas.