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Author(s):
S.-I. Itoh, K. Itoh, A. Yoshizawa and N. Yokoi
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Title:
Periodic Change of Solar Differential Rotation
Date of publication:
May 2004
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Key words:
helioseismology, solar rotation, solar magnetic field, differential rotation, cross-helicity dynamo, zonal flow, turbulence
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Abstract:
The periodic oscillation of the inhomogeneous rotation of the sun is studied by use of the MHD dynamo theory. There exists a turbulent electromotive force which is driven by the vorticity of the flow (i.e., the gamma dynamo). In addition, its counterpart exists in the vorticity equation, that is, the rotation is induced by inhomogeneous magnetic field in turbulent plasma. Based on this dynamo theory, a periodic change of solar differential rotation with the period of 11 yr is theoretically explained. The predicted amplitude is compared with observations.
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