Compressible Sub-Alfvenic MHD turbulence in Low-beta Plasmas

Details Compressible Sub-Alfvenic MHD turbulence in Low-beta Plasmas Compressible Sub-Alfvenic MHD turbulence in Low-beta Plasmas

2002-05-17

arxiv.org/abs/astro-ph/0205282v1

Phys.Rev.Lett. 88 (2002) 245001

Astronomy and Astrophysics

Astrophysics

4 pages, 8 figures, Phys. Rev. Lett., in press

Scientific paper

10.1103/PhysRevLett.88.245001

We present a model for compressible sub-Alfvenic isothermal magnetohydrodynamic (MHD) turbulence in low-beta plasmas and numerically test it. We separate MHD fluctuations into 3 distinct families - Alfven, slow, and fast modes. We find that, production of slow and fast modes by Alfvenic turbulence is suppressed. As a result, Alfven modes in compressible regime exhibit scalings and anisotropy similar to those in incompressible regime. Slow modes passively mimic Alfven modes. However, fast modes show isotropy and a scaling similar to acoustic turbulence.

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