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Compressible Sub-Alfvénic MHD Turbulence in Low-\(\beta \)Plasmas
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Abstract
We present a model for compressible sub-Alfvénic isothermal magnetohydrodynamic (MHD)
turbulence in low- beta plasmas and numerically test it. We separate MHD fluctuations
into three distinct families: Alfvén, slow, and fast modes. We find that production
of slow and fast modes by Alfvénic turbulence is suppressed. As a result, Alfvén modes
in compressible regime exhibit scalings and anisotropy similar to those in incompressible
regime. Slow modes passively mimic Alfvén modes. However, fast modes show isotropy
and a scaling similar to acoustic turbulence.