New turbulent large-scale magnetic dynamo mechanism

Abstract eng:
Among the large scale magnetic dynamo mechanisms occurring in turbulent MHD flows in many astrophysical objects such as stars, planets, accretions disks, galaxies etc. the so-called α-effect based on nonlinear interactions between the velocity and the magnetic fields of the fluctuating turbulent components is without a doubt the most commonly invoked. The large scale electromotive force, whcih is responsible for generation of the mean magnetic field is calculated as the cross-product of the wave-like solutions of the linearised equations for the velocity u′ and magnetic field b′ of the same mode, i.e. with the same complex growth rate. Here it is demonstrated that there exists a mechanism for mean electromotive force generation based on interactions of turbulent small scale fields of different modes, which does not even require the fluid’s resistivity to operate and which is potentially very effective.

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