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Moffatt drift driven large scale dynamo due to alpha fluctuations with nonzero correlation times (NOTE: UNUSUAL VENUE)
132:028 Nordita East ()
132:028 Nordita East
We present a theory of large--scale dynamo action in a
turbulent flow that has stochastic, zero--mean fluctuations of the
$\alpha$ parameter. Statistically inhomogeneous $\alpha$ fluctuations
give rise to finite Moffatt drift which always contributes positively to the
dynamo growth if correlation time of alpha fluctuations be nonzero.
We find that there exists a wavenumber cutoff at some large $k$ beyond
which the growth rate turns negative. This makes it a special dynamo as
the magnetic power at smallest length scales would be suppressed due
to the existence of wavenumber cutoff, thus enabling a bonafide large--scale