A paradigmatic model of Earth's magnetic field reversals

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dc.creatorStefani, F.
dc.creatorGerbeth, G.
dc.creatorGuenther, U.
dc.date2006-01-03
dc.date.accessioned2026-07-07T06:59:45Z
dc.date.available2026-07-07T06:59:45Z
dc.descriptionThe irregular polarity reversals of the Earth's magnetic field have attracted much interest during the last decades. Despite the fact that recent numerical simulations of the geodynamo have shown nice polarity transitions, the very reason and the basic mechanism of reversals are far from being understood. Using a paradigmatic mean-field dynamo model with a spherically symmetric helical turbulence parameter alpha we attribute the essential features of reversals to the magnetic field dynamics in the vicinity of an exceptional point of the spectrum of the non-selfadjoint dynamo operator. At such exceptional (branch) points of square root type two real eigenvalues coalesce and continue as a complex conjugated pair of eigenvalues. Special focus is laid on the comparison of numerically computed time series with paleomagnetic observations. It is shown that the considered dynamo model with high supercriticality can explain the observed time scale and the asymmetric shape of reversals with a slow decay and a fast field recovery.
dc.description7 pages, 6 figures, submitted to Magnetohydrodynamics
dc.identifierhttps://arxiv.org/abs/physics/0601011
dc.identifierhttp://arxiv.org/abs/physics/0601011
dc.identifierMagnetohydrodynamics 42 (2006) 123-130
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/107859
dc.subjectGeophysics
dc.subjectAstrophysics
dc.subjectPlasma Physics
dc.titleA paradigmatic model of Earth's magnetic field reversals
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