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- W2149356786 abstract "The transition to intermittent mean--field dynamos is studied using numerical simulations of isotropic magnetohydrodynamic turbulence driven by a helical flow. The low-Prandtl number regime is investigated by keeping the kinematic viscosity fixed while the magnetic diffusivity is varied. Just below the critical parameter value for the onset of dynamo action, a transient mean--field with low magnetic energy is observed. After the transition to a sustained dynamo, the system is shown to evolve through different types of intermittency until a large--scale coherent field with small--scale turbulent fluctuations is formed. Prior to this coherent field stage, a new type of intermittency is detected, where the magnetic field randomly alternates between phases of coherent and incoherent large--scale spatial structures. The relevance of these findings to the understanding of the physics of mean--field dynamo and the physical mechanisms behind intermittent behavior observed in stellar magnetic field variability are discussed." @default.
- W2149356786 created "2016-06-24" @default.
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- W2149356786 date "2009-11-21" @default.
- W2149356786 modified "2023-10-14" @default.
- W2149356786 title "A novel type of intermittency in a non-linear dynamo in a compressible flow" @default.
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- W2149356786 doi "https://doi.org/10.1111/j.1365-2966.2009.15483.x" @default.
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