Simon Candelaresi, Axel Brandenburg
Magnetic helicity fluxes in turbulently driven $\alpha^{2}$ dynamos are
studied to demonstrate their ability to alleviate catastrophic quenching. A
one-dimensional mean-field formalism is used to achieve magnetic Reynolds
numbers of $10^{5}$. We study both diffusive magnetic helicity fluxes through
the mid-plane as well as those resulting from the recently proposed alternate
dynamic quenching formalism. By adding shear we make a parameter scan for the
critical values of the shear and forcing parameters for which dynamo action
occurs. For this $\alpha\Omega$ dynamo we find that the preferred mode is
antisymmetric about the equatorial plane. This is also verified in 3-D direct
numerical simulations.
View original:
http://arxiv.org/abs/1111.2023
No comments:
Post a Comment