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Toward a dynamo model for the solar tachocline

✍ Scribed by Rolando Lillo; Pablo D. Mininni; Daniel O. Gómez

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
271 KB
Volume
349
Category
Article
ISSN
0378-4371

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✦ Synopsis

The generation of magnetic field on the Sun is caused by a dynamo mechanism, and is related with the differential rotation of the solar interior. Helioseismologic observations show that strong velocity gradients concentrate in a thin layer located at the base of the convective region, known as the tachocline. This remarkable observational finding lends support to a theoretical model for the solar dynamo, based on a magnetohydrodynamic extension of the so called shallow water approximation. We developed a numerical code to integrate the dynamic equations. Our analysis shows an initial stage during which the magnetic energy grows exponentially fast. In a subsequent stage we find that magnetic energy keeps growing until it reaches equipartition with the mechanical energy of the flow.

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## Abstract Most probably the sunspot cycle period is ruled by a meridional flow located near the base of the convection zone (Hathaway et al. 2003). On the other hand, if the eddy diffusivity is low enough, dramatic modification of the standard __α__ ^2^__Ω__ ‐dynamo by the meridional flow are exp