Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..300k&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, July 1, 1981, p. 300-311. Research supported by the Smithsonian Institution;
Astronomy and Astrophysics
Astrophysics
24
Magnetic Field Configurations, Magnetohydrodynamic Turbulence, Plasma Oscillations, Solar Magnetic Field, Turbulence Effects, Diffusivity, Eddy Viscosity, Power Spectra, Stellar Models, Taylor Instability
Scientific paper
Theoretical power spectra of magnetic fields subject to turbulent fluid motions in the kinematic regime are presented, and previous theories are reviewed, with reference to magnetic fields on the sun. Magnetic field diffusion in turbulence with persistent eddies is predicted to be described by an effective negative magnetic diffusivity. It is found that observations cannot be explained on the basis of turbulent kinematic theories unless the turbulent motions are three-dimensional, and the effective diffusivities are larger than the molecular diffusivities. Lower bounds on the turbulent viscosity are derived, suggesting that dynamical processes controlling the magnetic field spectrum occur at least 15,000 km below the surface. The results, which remain consistent with the assumption that effective diffusivity is uniform, suggest that surface magnetic field observations can be used as a diagnostic for subsurface flows.
Knobloch Eberhard
Rosner Robert
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