Physics – Geophysics
Scientific paper
2004-11-05
Phys.Rev.Lett. 94 (2005) 184506
Physics
Geophysics
5 pages, 7 figures
Scientific paper
10.1103/PhysRevLett.94.184506
Using a mean-field dynamo model with a spherically symmetric helical turbulence parameter alpha which is dynamically quenched and disturbed by additional noise, the basic features of geomagnetic polarity reversals are shown to be generic consequences of the dynamo action in the vicinity of exceptional points of the spectrum. This simple paradigmatic model yields long periods of constant polarity which are interrupted by self-accelerating field decays leading to asymmetric polarity reversals. It shows the recently discovered bimodal field distribution, and it gives a natural explanation of the correlation between polarity persistence time and field strength. In addition, we find typical features of coherence resonance in the dependence of the persistence time on the noise.
Gerbeth Gunter
Stefani Frank
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