Physics
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..117..237m&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 117, Issue 1-4, p. 237-258.
Physics
10
Scientific paper
This study assesses the influence of different prescribed parameters on the solutions of a 2-1/2 D hydromagnetic dynamo model. The numerical solution is fully resolved in r and θ, but severely truncated in φ so that only a single, prescribed value of the azimuthal wavenumber, m, is included in addition to the axisymmetric (m=0) part of the problem. This model is ideally suited for such a study since it is a self-consistent, convectively driven dynamo, capable of reproducing qualitatively similar axisymmetric magnetic fields to those of a Boussinesq 3D model, but at considerably lower computational effort. We have chosen to vary the Rayleigh number, Ra, for m=2 and m=4, and we find that the solution is dependent on the choice of both Ra and m. This means that the 2-1/2 D model is too severely truncated in φ, and suggests that caution should be exercised when interpreting the results from a single run of any convectively driven numerical dynamo model, at a particular value of Ra. For m=2, and all other parameters fixed, we have also investigated the effect of varying the inner core radius, giving some insight into possible effects of the growth of an inner core on magnetic field generation in planetary bodies. A stabilising effect on the magnetic field is unexpectedly observed for sufficiently small inner core radii. The anticipated stabilising effect is observed as our inner core radius increases from about its present value, until the dynamo shuts off for a radius ratio, χ, of about a half, for our fixed value of Ra.
Fearn David R.
Morrison Glenn
No associations
LandOfFree
The influence of Rayleigh number, azimuthal wavenumber and inner core radius on 2-1/2 D hydromagnetic 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 The influence of Rayleigh number, azimuthal wavenumber and inner core radius on 2-1/2 D hydromagnetic dynamos, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The influence of Rayleigh number, azimuthal wavenumber and inner core radius on 2-1/2 D hydromagnetic dynamos will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-810676