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http://hdl.handle.net/2122/3911| Authors: | Consolini, G.* De Michelis, P.* Meloni, A.* |
Title: | Multifractality and Punctuated Equilibrium in the Earth's Magnetic Field Polarity Reversals | 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 |
Subject Classification: | 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals | 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: | Article published / in press |
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