RädlerFest: Alpha Effect and Beyond

Session

Session 7

15 Feb 2011, 14:00

Wenner-Gren Center, floor 7, Hörsalen (Wenner Gren Center)

267. The negative magnetic pressure effect in stratified turbulence

Koen Kemel

15/02/2011, 14:00

A reduction of total mean turbulent pressure due to the presence of magnetic fields was previously shown to be a measurable effect in direct numerical simulations. However, in the studied parameter regime the formation of large-scale structures, as anticipated from earlier mean-field simulations, was not found. An analysis of the relevant mean-field parameter dependency and the parameter...

268. Magnetic helicity and its effect on the solar dynamo

Simon Candelaresi

15/02/2011, 14:20

The roles of magnetic helicity and magnetic helicity fluxes in astrophysical objects are investigated using various models and field configurations. Their roles in dynamo theory are confirmed through magnetohydrodynamic simulations both within the framework of mean-field theory and in direct numerical simulations. The constraint of magnetic helicity conservation in a periodic system at...

262. Effects of magnetic dissipation in a collapse of massive star

Dr Hidetomo Sawai

15/02/2011, 14:40

Magnetically driven supernovae have been studied well for several years. Although core-collapse simulations without magnetic fields to date cannot reproduce a successful explosion, every numerical simulation with initially strong magnetic field and rotation shows a jet-like explosion along the rotation axis. There a key agent of explosion is toroidal-magnetic pressure amplified by...

269. Tayler instability in incompressible and compressible domains

Dr Rainer Arlt

15/02/2011, 15:00

The Tayler instability may be a ubiquitous phenomenon in stellar magnetic problems. Previous results on the instability in incompressible domains will be compared to new results on the Tayler instability in compressible media.