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On the spectrum of turbulent magnetic fieldsTheoretical 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.
Document ID
19810059458
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Knobloch, E.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Rosner, R.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 11, 2013
Publication Date
July 1, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
Solar Physics
Accession Number
81A43862
Funding Number(s)
CONTRACT_GRANT: NAGW-79
Distribution Limits
Public
Copyright
Other

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