Mathematics of inviscid MHD dynamos and fundamental structure of core convection

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Numerical simulations of low-viscosity Earth-type dynamo show that, contrary to previous similar studies, an Earth-like strong magnetic field and a large-scale convection pattern can emerge. This contradiction arises because previous models imposed a geophysically inappropriate uniform-surface-temperature boundary condition. Although the core viscosity is much lower than the numerical models, it is suggested that a strong magnetic field and large-scale convection are still alive even in an inviscid limit.