Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-12
Geophys.Astrophys.Fluid Dynamics.102:21,2008
Astronomy and Astrophysics
Astrophysics
27 pages, 8 figures, submitted to GAFD
Scientific paper
10.1080/03091920701374772
The mean electromotive force (MEMF) in a rotating stratified magnetohydrodynamical turbulence is studied.Our study rests on the mean-field magnetohydrodynamics framework and $\tau$ approximation. We compute the effects of the large-scale magnetic fields (LSMF), global rotation and large-scale shear flow on the different parts of the MEMF (such as $\alpha$ - effect, turbulent diffusion, turbulent transport, etc.) in an explicit form. The influence of the helical magnetic fluctuations which stem from the small-scale dynamo is taken into account, as well. In the paper, we derive the equation governing the current helicity evolution. It is shown that the joint effect of the differential rotation and magnetic fluctuations in the stratified media can be responsible for the generation, maintenance and redistribution of the current helicity. The implication of the obtained results to astrophysical dynamos is considered as well.
No associations
LandOfFree
The mean electro-motive force, current- and cross-helicity under the influence of rotation, magnetic field and shear does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The mean electro-motive force, current- and cross-helicity under the influence of rotation, magnetic field and shear, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The mean electro-motive force, current- and cross-helicity under the influence of rotation, magnetic field and shear will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-647477