Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-29
Astronomy and Astrophysics
Astrophysics
17 pages, 9 figures, submitted to Phys. Earth Planet. Inter
Scientific paper
10.1016/j.pepi.2005.06.006
The equations for fully compressible rotating magnetoconvection are numerically solved in a Cartesian box assuming conditions roughly suitable for the geodynamo. The mean electromotive force describing the generation of mean magnetic flux by convective turbulence in the rotating fluid is directly calculated from the simulations, and the corresponding alpha-coefficients are derived. Due to the very weak density stratification the alpha-effect changes its sign in the middle of the box. It is positive at the top and negative at the bottom of the convection zone. For strong magnetic fields we also find a clear downward advection of the mean magnetic field. Both of the simulated effects have been predicted by quasi-linear computations (Soward, 1979; Kitchatinov and Ruediger, 1992). Finally, the possible connection of the obtained profiles of the EMF with mean-field models of oscillating alpha^2-dynamos is discussed.
Giesecke Alberto A.
Ruediger Guenther
Ziegler Udo
No associations
LandOfFree
Geodynamo alpha-effect derived from box simulations of rotating magnetoconvection 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 Geodynamo alpha-effect derived from box simulations of rotating magnetoconvection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Geodynamo alpha-effect derived from box simulations of rotating magnetoconvection will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-479218