An investigation of reversing numerical dynamos driven by either differential or volumetric heating

Physics of the Earth and Planetary Interiors

Volumn 176, Issue 1-2, 2009, Pages 69-82

  Rotvig, Jon ^a  

^a ETH ZURICH   (Switzerland)

Author keywords

Dynamo; Reversals; Rotation; Tangent cylinder; Thermal convection

Indexed keywords

BOUSSINESQ; CORE-MANTLE BOUNDARY; DYNAMO; EKMAN NUMBERS; EQUATORIAL UPWELLING; FIELD STATE; FILTERING METHOD; FLOW FLUCTUATIONS; INDUCTION PROCESS; INNER CORE; INNER CORE BOUNDARY; MAGNETIC DIPOLE; MAGNETIC PRANDTL NUMBERS; NET EFFECT; NONMAGNETICS; NUMERICAL DYNAMOS; ONSET OF CONVECTION; REVERSAL MECHANISM; REVERSALS; SHARP CONTRAST; SPHERICAL SHELL; STABILISATION; STRONG FIELD; TANGENT CYLINDER; THERMAL CONVECTION; UPWELLING PLUME; VISUAL INTERPRETATION; VOLUMETRIC HEATING;

CYLINDERS (SHAPES); HEAT CONVECTION; INTERACTIVE DEVICES; LORENTZ FORCE; MAGNETIC FIELD EFFECTS; ROTATION; THERMAL CONDUCTIVITY;

DC GENERATORS;

BUOYANCY; CORE-MANTLE BOUNDARY; GEODYNAMO; GEOMAGNETIC FIELD; INNER CORE; MAGNETIC REVERSAL; THERMAL CONVECTION;

EID: 68349154650     PISSN: 00319201     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.pepi.2009.04.003     Document Type: Article

References (22)

1. Al-Shamali F.M., Heimpel M.H., and Aurnou J.M. Varying the spherical shell geometry in rotating thermal convection. Geophys. Astrophys. Fluid Dyn. 98 (2004) 153-169
2. Aubert J. Steady zonal flows in spherical shell dynamos. J. Fluid Mech. 542 (2005) 53-67
3. Aubert J., Aurnou J., and Wicht J. The magnetic structure of convection-driven numerical dynamos. Geophys. J. Int. 172 (2008) 945-956
4. Christensen U.R., Olson P., and Glatzmaier G.A. Numerical modelling of the geodynamo: a systematic parameter study. Geophys. J. Int. 138 (1999) 393-409
5. Christensen U.R., Aubert J., Cardin P., et al. A numerical dynamo benchmark. Phys. Earth Planet. Int. 128 (2001) 25-34
6. Christensen U.R., and Aubert J. Scaling properties of convection-driven dynamos in rotating spherical shell and application to planetary magnetic fields. Geophys. J. Int. 117 (2006) 97-114
7. Heimpel M.H., Aurnou J.M., Al-Shamali F.M., and Gomez Perez N. A numerical study of dynamo action as function of spherical shell geometry. Earth Planet. Sci. Lett. 236 (2005) 542-557
8. Ishihara N., and Kida S. Dynamo mechanism in a rotating spherical shell: competition between magnetic field and convection vortices. J. Fluid Mech. 465 (2002) 1-32
9. Jones C.A., Soward A.M., and Mussa A.I. The onset of thermal convection in a rapidly rotating sphere. J. Fluid Mech. 405 (2000) 157-179
10. Kutzner C., and Christensen U.R. Effects of driving mechanisms in geodynamo models. Geophys. Res. Lett. 27 (2000) 29-32
11. Kutzner C., and Christensen U.R. From stable dipolar towards reversing numerical dynamos. Phys. Earth Planet. Int. 131 (2002) 29-45
12. Neyer, F.M., 2008. An investigation of numerical dynamo models with radially varying electrical conductivity. B.Sc. Thesis. ETH Zürich.
13. Pétrélis, F., Fauve, S., Dormy, E., Valet, J.-P., 2009. Simple mechanism for reversals of Earth's magnetic field. Phys. Rev. Lett. 102, 144503.
14. In: Roberts P.H., and Soward A.M. (Eds). Rotating fluids in geophysics (1978), Academic Press, London, New York
15. Rotvig, J., 2007. Multiple zonal jets and drifting: thermal convection in a rapidly rotating spherical shell compared to a quasi-geostrophic model. Phys. Rev. E 76, 046306, 1-9
16. Rotvig, J., in preparation. 2.7D models of the geodynamo at low magnetic Prandtl number.
17. Sarson G.R., and Jones C.A. A convection driven geodynamo reversal model. Phys. Earth Planet. Int. 111 (1999) 3-20
18. Sreenivasan B., and Gubbins D. Dynamos with weakly convecting outer layers: implications for core-mantle boundary interaction. Geophys. Astrophys. Fluid Dyn. 102 (2008) 395-407
19. Takahashi F., Matsushima M., and Honkura Y. Dynamo action and its temporal variation inside the tangent cylinder in MHD dynamo simulations. Phys. Earth Planet. Int. 140 (2003) 53-71
20. Takahashi F., Matsushima M., and Honkura Y. Scale variability in convection-driven MHD dynamos at low Ekman number. Phys. Earth Planet. Int. 167 (2008) 168-178
21. Wicht J. Inner-core conductivity in numerical dynamo simulations. Phys. Earth Planet. Int. 132 (2002) 281-302
22. Wicht, J., Olson, P., 2004. A detailed study of the polarity reversal mechanism in a numerical dynamo model. Geochem. Geophys. Geosyst. 5, Q03H10, 1-23.