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Author(s):
S.-I. Itoh, K. Itoh, P.H. Diamond and A. Yoshizawa
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Title:
Possible Global Magneto-fluid Structure of the Solar Convection Zone
Date of publication:
Oct. 2005
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Key words:
Solar plasmas, solar dynamo, cross helicity dynamo, meridional flow, convection zone, magneto-fluid torus, sun
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Abstract:
Structures of the magnetic field and velocity in the sun are discussed based on the mean field MHD equations. A special case is presented, where the solution is constructed by the Beltrami solution in the convection zone with the symmetry in the azimuthal direction. Magnetic field lines form concentric toroidal magnetic surfaces. Relation of this toroidal magnetic structure with the polarity rule of the sunspots is discussed. The cross-helicity dynamo mechanism induces a mean flow of plasmas. The structure of this driven flow is also shown to constitute toroidal surfaces. Considering the symmetry, it is shown that the latitudinal component of this flow is pole-ward in the northern as well as southern hemispheres. This gives an insight into the role of magnetic field for the meridional flow in the sun.
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