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A statistical model of reversals in the geodynamo Scullard, Christian R.


I study a simple model of a turbulent dynamo. Using a combination of analytic solutions and scaling arguments I derive a set of governing equations that describe the evolution of the magnetic field. This simplified system predicts behaviour which is qualitatively similar to that seen in the Earth's magnetic field and in numerical simulations. In particular, the model predicts multiple steady-field states, and that in certain cases the larger field states are more stable than their weaker counterparts. This provides a possible explanation for the observed periods of high stability in the geomagnetic field as well as for some of the observed behaviour in numerical simulations.

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