Power requirement of the geodynamo from ohmic losses in numerical and laboratory dynamos

Nature

Volumn 429, Issue 6988, 2004, Pages 169-171

  Christensen, Ulrich R ^a   Tilgner, Andreas ^b  

^a MAX PLANCK INSTITUT FÜR SONNENSYSTEMFORSCHUNG   (Germany)

^b UNIVERSITY OF GÖTTINGEN   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

ELECTRIC LOSSES; ENERGY CONVERSION; GEOMAGNETISM; HYDRODYNAMICS; REYNOLDS NUMBER;

GRAVITATIONAL ENERGY; MAGNETIC ENERGY; OHMIC LOSSES; VISCOUS DIFFUSION;

DC GENERATORS;

ELECTRICAL RESISTIVITY; GEODYNAMO; HYDRODYNAMICS; NUMERICAL MODEL; OUTER CORE;

ARTICLE; ASTRONOMY; CALCULATION; DIFFUSION; ELECTRIC RESISTANCE; ENERGY RESOURCE; EVOLUTION; GRAVITY; HEAT TRANSFER; HEATING; HYDRODYNAMICS; MAGNETIC FIELD; MAGNETISM; MATHEMATICAL ANALYSIS; MODEL; PREDICTION; PRIORITY JOURNAL; RADIOACTIVITY; ROTATION; THERMAL CONDUCTIVITY; THERMODYNAMICS; TURBULENT FLOW; VISCOSITY;

EID: 2442672991     PISSN: 00280836     EISSN: None     Source Type: Journal    
DOI: 10.1038/nature02508     Document Type: Article

References (21)

1. Buffett, B. A. Estimates of heat flow in the deep mantle based on the power requirements of the geodynamo. Geophys. Res. Lett. 29, doi:1.1029/2001GL014649 (2002).
2. Roberts, P. H., Jones, C. A. & Calderwood, A. R. in Earth's Core and Lower Mantle (eds Jones, C. A., Soward, A. M. & Zhang, K.) 100-129 (Taylor & Francis, London, 2003).
3. Labrosse, S. Thermal and magnetic evolution of the Earth's core. Phys. Earth Planet. Inter. 140, 127-143 (2003).
4. Gubbins, D., Alfe, D., Masters, G., Price, D. & Gillan, M. J. Can the Earth's dynamo run on heat alone? Geophys. J. Int. 155, 609-622 (2003).
5. Nimmo, F., Price, G. D., Brodholt, J. & Gubbins, D. The influence of potassium on core and geodynamo evolution. Geophys. J. Int. 156. 363-376 (2004).
6. Stieglitz, R. & Müller, U. Experimental demonstration of the homogeneous two-scale dynamo. Phys. Fluids 13, 561-564 (2001).
7. Gessmann C. K. & Wood, B. J. Potassium in the Earth's core? Earth Planet Sci. Lett. 2000, 63-78 (2002).
8. Langel, R. A. & Estes, R. H. A geomagnetic field spectrum. Geophys. Res. Lett. 9, 250-253 (1982).
9. Kuang, W. & Bloxham, J. An Earth-like numerical dynamo model. Nature 389, 371-374 (1997).
10. Roberts, P. H. & Glatzmaier, G. A. A test of the frozen-flux approximation using a new geodynamo model. Phil. Trans. R. Soc. Lond. A 358, 1109-1121 (2000).
11. Christensen, U., Olson, P. & Glatzmaier, G. A. Numerical modeling of the geodynamo: a systemic parameter study. Geophys. J. Int. 138, 393-409 (1999).
12. Kutzner, C. & Christensen, U. R. From stable dipolar to reversing numerical dynamos. Phys. Earth Planet. Inter. 131, 29-45 (2002).
13. Müller, U. & Stieglitz, R. The Karlsruhe dynamo experiment. Nonlin. Proc. Geophys. 9, 165-170 (2002).
14. Tilgner, A. Numerical simulation of the onset of dynamo action in an experimental two-scale dynamo. Phys. Fluids 14, 4092-4094 (2002).
15. Hulot, G. & LeMouël, J. L. A statistical approach to the Earth's main magnetic field. Phys. Earth Planet. Inter. 82, 167-183 (1994).
16. Bloxham, J. & Jackson, A. Time-dependent mapping of the magnetic field at the core-mantle boundary. J. Geophys. Res. 97, 19537-19563 (1992).
17. Buffett, B. A. The thermal state of the Earth's core. Science 299, 1675-1676 (2003).
18. Rama Murthy, V., van Westrenen, W. & Fei, Y. Experimental evidence that potassium is a substantial radioactive heat source in planetary cores. Nature 423, 163-165 (2003).
19. McElhinny, M. W. & Senanayake, W. E. Paleomagnetic evidence for the existence of the geomagnetic field 3.5Ga ago. J. Geophys. Res. 85, 3523-3528 (1980).
20. Secco, R. A. & Schloessin, H. H. The electrical resistivity of solid and liquid Fe at pressures up to 7 GPa. J. Geophys. Res. 94, 5887-5894 (1989).
21. Bloxham, J., Gubbins, D. & Jackson, A. Geomagnetic secular variations. Phil. Trans. R. Soc. Lond. A 329, 415-502 (1989).