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Dynamic alignment and plasmoid formation in relativistic magnetohydrodynamic turbulence
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abstract
We present high resolution 2D and 3D simulations of magnetized decaying turbulence in relativistic resistive magneto-hydrodynamics. The simulations show dynamic formation of large scale intermittent long-lived current sheets being disrupted by the tearing instability into plasmoid chains. These current sheets are locations of enhanced magnetic field dissipation and heating of the plasma. We find magnetic energy spectra $\propto k^{-3/2}$, together with strongly pronounced dynamic alignment of Elsasser fields and of velocity and magnetic fields, for strong guide-field turbulence, whereas we retrieve spectra $\propto k^{-5/3}$ for the case of a weak guide-field.
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Local relaxation and scale-dependent alignment in compressible, magnetized turbulence
In a 10,080^3 simulation of compressible magnetized turbulence, the velocity-magnetic alignment angle scales as λ^{1/8} instead of the theoretical λ^{1/4}, while velocity-vorticity alignment scales as λ^{1/16}.
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