SmallScale Turbulent Dynamo
Abstract
Kinematic dynamo theory is presented here for turbulent conductive fluids. We describe how inhomogeneous magnetic fluctuations are generated below the viscous scale of turbulence where the spatial smoothness of the velocity permits a systematic analysis of the Lagrangian path dynamics. We find analytically the moments and multipoint correlation functions of the magnetic field at small yet finite magnetic diffusivity. We show that the field is concentrated in long narrow strips and describe anomalous scalings and angular singularities of the multipoint correlation functions which are manifestations of the field's intermittency. The growth rate of the magnetic field in a typical realization is found to be half the difference of two Lyapunov exponents of the same sign.
 Publication:

Physical Review Letters
 Pub Date:
 November 1999
 DOI:
 10.1103/PhysRevLett.83.4065
 arXiv:
 arXiv:chaodyn/9906030
 Bibcode:
 1999PhRvL..83.4065C
 Keywords:

 Nonlinear Sciences  Chaotic Dynamics
 EPrint:
 4 pages, no figures