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The asymmetric time dependence and various statistical properties of polarityreversals of the Earth's magnetic field are utilized to infer some of the mostessential parameters of the geodynamo, among them the effective (turbulent)magnetic diffusivity, the degree of supercriticality, and the relative strengthof the periodic forcing which is believed to result from the Milankovic cycleof the Earth's orbit eccentricity. A time-stepped spherically symmetricalpha^2-dynamo model is used as the kernel of an inverse problem solver in formof a downhill simplex method which converges to solutions that yield a stunningcorrespondence with paleomagnetic data.

Inferring basic parameters of the geodynamo from sequences of polarity reversals