Wolf-Christian Mueller
TU Berlin, Plasma-Astrophysics, Berlin Germany
Non-asymptotic and non-universal turbulence in magnetic fields
|
Magnetohydrodynamic (MHD) turbulence in a mean magnetic field can
exist in fundamentally different regimes. Its character can, for
example, be changed from "weak" to "strong" where these attributes
basically express different ratios of characteristic timescales of
the system. This possibility of manipulation can be exploited by
carefully changing the large-scale excitation mechanism of the
turbulence. A regime of "weakened" MHD turbulence is presented that
exhibits isotropic similarity properties which are beyond the current
theoretical understanding of turbulence in magnetic fields and whose
dynamics are explained in terms of quasi-resonant nonlinear
interactions.
|