Time-Evolution of the Earth's Magnetic Field During a Simulated Reversal

Shown is the radial magnetic field of our Earth-like dynamo (chemical convection at E = 3x10-4, Pm = 3, Ra = 35 times critical). Red colors positive, blue negative values. The animations cover the time interval from Fig. 8 of Kutzner and Christensen (2002) [3], see also Fig. 9 therein. Time t above the animations is given in magnetic diffusion time.

Fig. 1: This animation shows the field as it would appear at the surface of the Earth. Contour step is 0.0055.

Fig. 2: Field at the core-mantle-boundary (CMB), contour step is 0.29. View onto the north pole of the CMB. Notice the strong flux patches that form above the pole at time t=1.866. They are due to expulsion of toroidal field by an upwelling plume.

Fig. 3: Field at the CMB, contour step is 0.29. View onto the south pole of the CMB.

Publications

C. Kutzner, U. R. Christensen
Simulated Geomagnetic Reversals and Preferred Virtual Geomagnetic Pole Paths
Geophys. J. Int. 157 (3): 1105–1118, 2004
C. Kutzner
Untersuchung von Feldumkehrungen an einem numerischen Modell des Geodynamos
Dissertation, Georg-August-Universität Göttingen, 2003
C. Kutzner, U. R. Christensen
From Stable Dipolar Towards Reversing Numerical Dynamos
Phys. Earth Planet. Int. 131 (1): 29–45, 2002
C. Kutzner, U. R. Christensen
Effects of Driving Mechanisms in Geodynamo Models
Geophys. Res. Lett. 27 (1): 29–32, 2000
C. Kutzner
Numerische Simulationen zum Geodynamo: Einfluß verschiedener Antriebsarten auf Strömung und Magnetfeld
Diplomarbeit, Institut für Geophysik, Universität Göttingen, 1999
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