Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmgp43a0891a&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #GP43A-0891
Physics
1510 Dynamo: Theories And Simulations, 5400 Planetary Sciences: Solid Surface Planets, 5700 Planetary Sciences: Fluid Planets
Scientific paper
We have performed a parameter space survey for numerical MHD dynamos in rotating spherical shells, varying all relevant control parameters.Simple scaling laws have been derived for the typical amplitude of the convection flow, of the zonal flow and of the magnetic field. The key parameter in these scaling relationships is the buoyancy flux, which measures the quantity of energy made available to the dynamo, irrespectively of the nature (chemical or thermal) of convection. The scaling for the magnetic field is strikingly independant on rotation rate of the planet. This fact is discussed in connection with the role of the Coriolis force in the dynamo system and dimensional analysis. The scalings are then applied to evaluate the buoyancy flux in the Earth's core. The result is compatible with an aged (more than three billion years old) inner core. On Jupiter the surface magnetic field, surface zonal flow and excess heat flow are also found to be compatible with the scalings. Further modelling is presented to treat the more complex cases of Uranus and Neptune.
Aubert Julien
Christensen Ulrich
No associations
LandOfFree
Scaling properties of planetary dynamos 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 Scaling properties of planetary dynamos, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scaling properties of planetary dynamos will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-752018