Structure of Stationary Strong Imbalanced Turbulence

Details Structure of Stationary Strong Imbalanced Turbulence Structure of Stationary Strong Imbalanced Turbulence

2009-04-16

arxiv.org/abs/0904.2574v2

Astrophys.J.702:460-471,2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages, 13 figs, ApJ accepted

Scientific paper

10.1088/0004-637X/702/1/460

In this paper we systematically study the spectrum and structure of incompressible MHD turbulence by means of high resolution direct numerical simulations. We considered both balanced and imbalanced (cross-helical) cases and simulated sub-Alfvenic as well as trans-Alfvenic turbulence. This paper extends numerics preliminarily reported in Beresnyak & Lazarian (2008). We confirm that driven imbalanced turbulence has a stationary state even for high degrees of imbalance. Our major finding is that the structure of the dominant and subdominant Alfvenic components are notably different. Using the most robust observed quantities, such as the energy ratio, we were able to reject several existing models of strong imbalanced turbulence.

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