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1 results

  • Are tachoclines important for solar and stellar dynamos? What can we learn from global simulations

  • G. Guerrero, P. K. Smolarkiewicz, E. M. de Gouveia Dal Pino, A. G. Kosovichev, B. Zaire, N. N. Mansour
  • Journal:
    Proceedings of the International Astronomical Union / Volume 12 / Issue S328 / October 2016
    Published online by Cambridge University Press:
    12 September 2017, pp. 61-68
    Print publication:
    October 2016
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  • The role of tachoclines, the thin shear layers that separate solid body from differential rotation in the interior of late-type stars, in stellar dynamos is still controversial. In this work we discuss their relevance in view of recent results from global dynamo simulations performed with the EULAG-MHD code. The models have solar-like stratification and different rotation rates (i.e., different Rossby number). Three arguments supporting the key role of tachoclines are presented: the solar dynamo cycle period, the origin of torsional oscillations and the scaling law of stellar magnetic fields as function of the Rossby number. This scaling shows a regime where the field strength increases with the rotation and a saturated regime for fast rotating stars. These properties are better reproduced by models that consider the convection zone and a fraction of the radiative core, naturally developing a tachocline, than by those that consider only the convection zone.