Scale variability in convection-driven MHD dynamos at low Ekman number

Details Scale variability in convection-driven MHD dynamos at low Ekman number Scale variability in convection-driven MHD dynamos at low Ekman number

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pepi..167..168t&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 167, Issue 3-4, p. 168-178.

Physics

19

Scientific paper

We have undertaken a numerical study of convection-driven MHD dynamos in a rapidly rotating spherical shell with the Ekman number, E, down to 2×10 and the magnetic Prandtl number, Pm, down to 0.2. We focus on the characteristic scales of the flow and the magnetic field. Smaller-scale convection vortices responsible for generating the magnetic field appear at lower Ekman numbers, while the scale of the magnetic field shows less variation compared with the flow. As a result, scale separation between the flow and the magnetic field occurs as the Ekman number is decreased. Scale separation helps dynamos to maintain the magnetic field at Pm<1 through increase in the effective value of the magnetic Reynolds number.

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