期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 722, 期 1, 页码 L110-L113出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/722/1/L110
关键词
ISM: kinematics and dynamics; magnetohydrodynamics (MHD); turbulence
资金
- NSF [AST-0808118]
- Center for Magnetic Self-Organization [LA-UR 10-05945]
- IceCube project
The search of ways to generalize the theory of strong MHD turbulence for the case of non-zero cross-helicity (or energy imbalance) has attracted considerable interest recently. In our earlier publications, we performed three-dimensional numerical simulations and showed that some of the existing models are inconsistent with numerics. In this Letter, we focused our attention on low-imbalance limit and performed new high-resolution simulations. The results strongly suggest that in the limit of small imbalances we smoothly transition to a standard Goldreich-Sridhar balanced model. We also claim that the Perez-Boldyrev model that predicts the same nonlinear timescale for both components due to the so-called dynamic alignment strongly contradicts numerical evidence.
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