Magnetic Fluctuations for Small Magnetic Prandtl Numbers Academic Article uri icon

abstract

  • Numerous studies of magnetic fluctuations with a zero mean-field for small magnetic Prandtl numbers (Pr m≪ 1) show that magnetic fluctuations cannot be generated by turbulent fluid flow with the Kolmogorov energy spectrum. In addition, the generation of magnetic fluctuations with a zero mean-field for Pr m≪ 1 were not observed in numerical simulations. However, in astrophysical plasmas the magnetic Prandtl numbers are small and magnetic fluctuations are observed. Thus a mechanism of generation of magnetic fluctuations for Pr m≪ 1 still remains poorly understood. On the other hand, in astrophysical applications (eg, solar and stellar convection zones, galaxies, accretion disks) the turbulent velocity field cannot be considered as a divergence-free. The generation of magnetic fluctuations by turbulent flow of conducting fluid with a zero mean magnetic field for Pr m≪ 1 is studied …

publication date

  • July 1, 1998