  Suppression of fluctuations of normally perturbed magnetic fields in dynamo
waves and slow dynamos along curved (folded), torsioned (twisted) and
non-stretched, diffusive filaments are obtained. This form of fluctuations
suppression has been recently obtained by Vainshtein et al [PRE 56, (1997)] in
nonlinear ABC and stretch-twist-fold (STF) dynamos by using a magnetic Reynolds
number of the order of $Rm\approx{10^{4}}$. Here when torsion does not vanish
an expression between magnetic Reynolds number and length scale L as with
constant torsion ${\tau}_{0}$ itself is obtained, such as
$Rm\approx{\frac{{\tau}_{0}L}{\eta}}$ is obtained. At coronal loops
$Rm\approx{10^{12}}$ and torsion of the twisted structured loop from
astronomical data by Lopez-Fuentes et al [Astron. and Astrophys. (2003)] of
${\tau}\approx{9.0{\times}10^{-10}}cm^{-1}$ is used to compute a very slow
magnetic diffusion of ${\eta}\approx{10^{-8}}$. The slow dynamo obtained here
is in agreement with Vishik arguement that fast dynamo cannot be obtained in
non-stretched dynamo flows. When torsion vanishes helical turbulence is
quenched and but ${\alpha}$-dynamos cannot be maintained since exponential
stretching depends on torsion. This is actually Zeldovich antidynamo theorem
for torsion-free or planar filaments which has been discussed by the other also
recently in another context [Astr Nach. (2008)]. The suppression of magnetic
field fluctuations is actually a result of the coupling of the magnetic
diffusion and Frenet torsion of helical turbulence.
