New Regime of MHD Turbulence: Cascade Below Viscous Cutoff

Details New Regime of MHD Turbulence: Cascade Below Viscous Cutoff New Regime of MHD Turbulence: Cascade Below Viscous Cutoff

2001-12-07

arxiv.org/abs/astro-ph/0112195v2

Astrophys. J., 566, L49 (2002)

Astronomy and Astrophysics

Astrophysics

ApJ Letters, accepted (Feb. 10, 2002; ApJ, 566, L...); 10 pages, 3 figures

Scientific paper

10.1086/339453

In astrophysical situations, e.g. in the interstellar medium (ISM), neutrals can provide viscous damping on scales much larger than the magnetic diffusion scale. Through numerical simulations, we have found that the magnetic field can have a rich structure below the dissipation cutoff scale. This implies that magnetic fields in the ISM can have structures on scales much smaller than parsec scales. Our results show that the magnetic energy contained in a wavenumber band is independent of the wavenumber and magnetic structures are intermittent and extremely anisotropic. We discuss the relation between our results and the formation of the tiny-scale atomic structure (TSAS).

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