Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh41a1119o&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SH41A-1119
Physics
7827 Kinetic And Mhd Theory, 7863 Turbulence (4490), 7868 Wave/Wave Interactions, 9800 General Or Miscellaneous
Scientific paper
The dynamics of MHD systems often involve an intricate interaction between (Alfvén) waves and nonlinear fluctuations (or, turbulence). Here we discuss a two-component phenomenology for MHD, wherein the fluctuations are treated as being of either a ``wave-like'' type or a turbulence type. The distinction between the types is made in Fourier space, on the basis of which of the wave and nonlinear timescales is the shorter. The phenomenology is a one-point closure and models the evolution of the energy in each component and the associated lengthscales. It is valid for arbitrary mean magnetic field strengths (B_0), and reproduces well-known results in appropriate limiting cases such as either very weak or very strong B_0. The development of the model will be outlined and solutions for a range of initial conditions and forcing types will be presented.
Dmitruk Pablo
Matthaeus William H.
Oughton Sean
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