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- W1234676130 abstract "A heuristic model is given for anisotropic magnetohydrodynamics (MHD) turbulence in the presence of a uniform external magnetic field $B_0 {bf {hat e}_{pa}}$. The model is valid for both moderate and strong $B_0$ and is able to describe both the strong and weak wave turbulence regimes as well as the transition between them. The main ingredient of the model is the assumption of constant ratio at all scales between add{the} linear wave period and add{the} nonlinear turnover timescale. Contrary to the model of critical balance introduced by Goldreich and Sridhar [P. Goldreich and S. Sridhar, ApJ {bf 438}, 763 (1995)], it is not assumed in addition that this ratio be equal to unity at all scales which allows us to use the Iroshnikov-Kraichnan phenomenology. It is then possible to recover the widely observed anisotropic scaling law $kpa propto kpe^{2/3}$ between parallel and perpendicular wavenumbers (with reference to $B_0 {bf {hat e}_{pa}}$) and to obtain the universal prediction, $3alpha + 2beta = 7$, for the total energy spectrum $E(kpe,kpa) sim kpe^{-alpha} kpa^{-beta}$. In particular, with such a prediction the weak Alfven wave turbulence constant-flux solution is recovered and, for the first time, a possible explanation to its precursor found numerically by Galtier et al [S. Galtier et al., J. Plasma Phys. {bf 63}, 447 (2000)] is given." @default.
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- W1234676130 date "2005-04-28" @default.
- W1234676130 modified "2023-09-27" @default.
- W1234676130 title "On scaling laws for incompressible anisotropic MHD turbulence" @default.
- W1234676130 hasPublicationYear "2005" @default.
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