The clustering of polarity reversals of the geomagnetic field

Details The clustering of polarity reversals of the geomagnetic field The clustering of polarity reversals of the geomagnetic field

2006-03-10

arxiv.org/abs/physics/0603086v1

Phys.Rev.Lett. 96 (2006) 128501

Physics

Geophysics

4 pages, in press on PRL (31 march 2006?)

Scientific paper

10.1103/PhysRevLett.96.128501

Often in nature the temporal distribution of inhomogeneous stochastic point processes can be modeled as a realization of renewal Poisson processes with a variable rate. Here we investigate one of the classical examples, namely the temporal distribution of polarity reversals of the geomagnetic field. In spite of the commonly used underlying hypothesis, we show that this process strongly departs from a Poisson statistics, the origin of this failure stemming from the presence of temporal clustering. We find that a Levy statistics is able to reproduce paleomagnetic data, thus suggesting the presence of long-range correlations in the underlying dynamo process.

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