Magnetic Helicity Fluxes and their Effect on Stellar Dynamos

Candelaresi, S. and Brandenburg, A. (2011) Magnetic Helicity Fluxes and their Effect on Stellar Dynamos. In: Comparative Magnetic Minima: Characterizing Quiet Times in the Sun and Stars, Mendoza, Argentina, 03-07 Oct 2011, pp. 49-53. (doi: 10.1017/S1743921312004620)

Abstract

Magnetic helicity fluxes in turbulently driven α² 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 the order of 10⁵. 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 αΩ dynamo we find that the preferred mode is antisymmetric about the mid-plane. This is also verified in 3-D direct numerical simulations.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Candelaresi, Dr Simon
• Authors: Candelaresi, S., and Brandenburg, A.
• College/School: College of Science and Engineering > School of Mathematics and Statistics > Mathematics
• ISSN: 1743-9213