Magnetic-field generation in helical turbulence

Details Magnetic-field generation in helical turbulence Magnetic-field generation in helical turbulence

2005-04-27

arxiv.org/abs/astro-ph/0504588v2

Phys. Rev. Lett. 95 (2005) 255001

Astronomy and Astrophysics

Astrophysics

4 pages

Scientific paper

10.1103/PhysRevLett.95.255001

We investigate analytically the amplification of a weak magnetic field in a homogeneous and isotropic turbulent flow lacking reflectional symmetry (helical turbulence). We propose that the spectral distributions of magnetic energy and magnetic helicity can be found as eigenmodes of a self-adjoint, Schr\"odinger-type system of evolution equations. We argue that large-scale and small-scale magnetic fluctuations cannot be effectively separated, and that the conventional alpha-model is, in general, not an adequate description of the large-scale dynamo mechanism. As a consequence, the correct numerical modeling of such processes should resolve magnetic fluctuations down to the very small, resistive scales.

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