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DIFFUSIO N AN D CORRELATION S O F MAGNETI C FIEL D I N A TURBULEN T MEDIU M

N. A. Silant'ev Central Astronomical Observatory, USSR Academy of Sciences, Pulkovo, 196140, Leningrad, USSR

ABSTRACT. The diffusion and correlations of a magnetic field in a homogeneous isotropic turbulent medium are considered. The turand the generation coefficient bulent diffusivity )in a medium with helicity are derived as the functions of ( = r R, where u , r and R are the the Strouhal number characteristic velocity, the lite time and the correlation length, respectively. The explicit formulae for the second order correlators of magnetic field are derived. It is shown that the initial magnetic fluctuations may be strictly amplified by the turbulent motions for a short time and then decreased to zero due to the action of the ohmic dissipation.
T U / 0 0 0 Q Q Q