Scaling and intermittency in incoherent α-shear dynamo

Details Scaling and intermittency in incoherent α-shear dynamo Scaling and intermittency in incoherent α-shear dynamo

2011-07-12

arxiv.org/abs/1107.2419v2

Monthly Notices Roy. Astron. Soc. 420, 2170-2177 (2012)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

(new appendix added)consistent with the published version

Scientific paper

10.1111/j.1365-2966.2011.20190.x

We consider mean-field dynamo models with fluctuating \alpha effect, both with and without shear. The \alpha effect is chosen to be Gaussian white noise with zero mean and given covariance. We show analytically that the mean magnetic field does not grow, but, in an infinitely large domain, the mean-squared magnetic field shows exponential growth of the fastest growing mode at a rate proportional to the shear rate, which agrees with earlier numerical results of Yousef et al (2008) and recent analytical treatment by Heinemann et al (2011) who use a method different from ours. In the absence of shear, an incoherent \alpha^2 dynamo may also be possible. We further show by explicit calculation of the growth rate of third and fourth order moments of the magnetic field that the probability density function of the mean magnetic field generated by this dynamo is non-Gaussian.

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