**Wolf-Christian Müller**

Max-Planck-Institut für Plasmaphysik

**Wednesday, December 3, 2008**

**Center Green Laboratory 1, Room 2503**

**Lecture 3:30pm**

### The Inverse Cascade of Magnetic Helicity

The inverse cascade of magnetic helicity in three-dimensional magnetohydrodynamic turbulence is studied by means of high-resolution
direct numerical simulations (DNS) of decaying and small-scale-driven
turbulent flows. In the decaying case observed self-similar inertial-range
behavior of the magnetic helicity spectrum is significantly different
from the results of earlier two-dimensional studies based on statistical
closure models. The findings are explained by a model based on the
statistical eddy-damped quasi-normal Markovian closure theory
(EDQNM). It is shown that the inverse cascade of magnetic helicity is
governed by the chirality of the turbulent velocity field.