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- W2029046878 abstract "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 $ensuremath{varphi}$ and $z$ components of velocity can help to grow a magnetic field. This model postulates a large-scale flow having $ensuremath{varphi}$ and $z$ components with radial dependences (helical flow). Shear in the radial field, because of a near-flux-freezing condition, causes amplification of the $ensuremath{varphi}$ 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 $ensuremath{alpha}$ effect; nevertheless, turbulent diffusion forms an important part in the overall mechanism." @default.
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- W2029046878 date "1997-09-01" @default.
- W2029046878 modified "2023-10-16" @default.
- W2029046878 title "Screw dynamo and the generation of nonaxisymmetric magnetic fields" @default.
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- W2029046878 doi "https://doi.org/10.1103/physreve.56.2869" @default.
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