In decaying sub-sonic MHD turbulence simulations, the amplitude and plasma beta, not the injection wave type, set the turbulent density fluctuation level, while curvature and mirror statistics change dramatically with injection, amplitude, and beta.
Local relaxation and scale-dependent alignment in compressible, magnetized turbulence
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abstract
Driven net- and no-net-flux MHD turbulence simulations up to $10,\!368^3$ reveal sign-mixed velocity-magnetic, velocity-vorticity, and magnetic-current aligned patches below the energy equipartition scale. The first two angles scale as $\lambda^{1/8}$ and $\lambda^{1/16}$, while magnetic-current alignment varies weakly with scale. We develop and test a constant-flux transport model for departures from relaxed states, which predicts both exponents. These findings affect eddy anisotropy, reconnection-mediated turbulence onset, large-scale dynamos, and the nature of magnetized turbulence.
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physics.plasm-ph 1years
2026 1verdicts
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Sub-sonic compressible magnetohydrodynamic turbulence I. Alfv\'enic and fast-magnetosonic injection, amplitude dependence, and compressibility effects
In decaying sub-sonic MHD turbulence simulations, the amplitude and plasma beta, not the injection wave type, set the turbulent density fluctuation level, while curvature and mirror statistics change dramatically with injection, amplitude, and beta.