Physics
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phrve..56.2869b&link_type=abstract
Physical Review E (Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics), Volume 56, Issue 3, September 19
Physics
5
Origins And Models Of The Magnetic Field, Dynamo Theories
Scientific paper
A mechanism is presented here for the amplification of large-scale nonaxisymmetric magnetic fields as a manifestation of the dynamo effect. We generalize a result on restrictions of dynamo actions due to laminar flow originally derived by Zeldovich, Ruzmaikin, and Sokolov [Magnetic Fields in Astrophysics (Gordon and Breach, New York, 1983)]. We show how a screwlike motion having φ and z components of velocity can help to grow a magnetic field. This model postulates a large-scale flow having φ and z components with radial dependences (helical flow). Shear in the radial field, because of a near-flux-freezing condition, causes amplification of the φ component of the magnetic field. The radial and axial components grow due to the presence of turbulent diffusion. The shear in the large-scale flow induces an indefinite growth of magnetic field without the α effect; nevertheless, turbulent diffusion forms an important part in the overall mechanism.
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