The meridional flow, visualized here by moving corks, sets the period of the Sun's magnetic cycle by transporting the magnetic field around the convection in 22 years (two sunspot cycles). This material relates to a paper that appeared in the 26 June issue of Science, published by AAAS. The paper, by L. Gizon at Max-Planck-Institut für Sonnensystemforschung in Göttingen, Germany and colleagues was titled, "Meridional flow in the Sun's convection zone is a single cell in each hemisphere."
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