Global Simulations of Convective Dynamos in the Sun and Stars

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It is clear from solar and stellar observations that convection breeds magnetism. It is also clear that rotation and rotational shear promote the generation of magnetic energy. Dynamo theory tells us that rotation and shear also promote magnetic self-organization; the generation of spatially and temporally ordered field patterns from relatively complex flows. Examples include coherent bands of toroidal flux, dipole moments, and cyclic polarity reversals. Numerical simulations of solar and stellar convection in rotating spherical shells exhibit similar self-organization. I will review how convective dynamos build cyclic or chaotic large-scale fields and what implications this has for the vibrant magnetic activity observed in the Sun and other late-type stars.

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