Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-06
Proc. 29th EPS Conf. on Plasma Phys. and Contr. Fusion Montreux, 17-21 June 2002, ECA Vol. 26B, P-4.035 (2002)
Astronomy and Astrophysics
Astrophysics
latex, 4 pages
Scientific paper
This is a brief review of the main results of our recent studies of the nonlinear evolution of the small-scale MHD dynamo in the high-Prandtl-number regime and of the structure of the resulting saturated state of the isotropic homogeneous MHD turbulence. It is emphasized that the MHD regime without a uniform mean field (as is the case in our studies) is fundamentally different from the one in which such a field is externally imposed. The ability of the turbulence to bend and fold the magnetic-field lines leads to the emergence of a distinctive small-scale structure. The fields are organized in folds of characteristic length comparable to the size of the largest turbulent eddies with spatial-direction reversals at the resistive scale. These folds are very hard to destroy. In the nonlinear regime, the folding structure coexists with Alfven waves propagating along the folds. The turbulent energy injected by the forcing is dissipated in part resistively via the small-scale magnetic fields, and in part viscously via the Alfven waves.
Cowley Steve C.
Hammett Gregory W.
Maron Jason L.
McWilliams James C.
Schekochihin Alexander A.
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