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Authors: Consolini, G.*
De Michelis, P.*
Meloni, A.*
Title: Multifractality and Punctuated Equilibrium in the Earth's Magnetic Field Polarity Reversals
Title of journal: Geophysical Research Letters
Series/Report no.: 2 / 27 (2000)
Publisher: AGU
Issue Date: 15-Jan-2000
Keywords: Magnetic field polarity reversals
Multifractal approach
Punctuated equilibrium
Abstract: The Earth's magnetic field has reversed its polarity hundreds of times in the Earth's history. This phenomenon is generally viewed as due to a Poisson nonstationary process. Here, the geomagnetic chron time length sequence for the past 166 Ma, is analyzed using a multifractal approach, based on "singularity analysis". The existence of a multifractal structure is the signature of the occurrence of "punctuated equilibrium", which can be read as an indication of a critical configuration of the geodynamo. The results obtained are compared with those from a prototypical model of a dynamical system, introduced by Seki & Ito [1993], and are discussed in the context of fluid motions within the Earth's outer liquid core.
Appears in Collections:04.05.02. Geomagnetic field variations and reversals
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