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Authors: Barraclogh, D. R.*
De Santis, A.*
Title: Some possible evidence for a chaotic geomagnetic field from observational data
Title of journal: Physics of the Earth and Planetary Interiors
Series/Report no.: 3-4 / 99 (1997)
Publisher: Elsevier
Issue Date: Feb-1997
Keywords: geomagnetic field
non-linear forecasting approach
Abstract: The behaviour of the geomagnetic field as observed almost continuously at three European locations over the last 130 years is investigated by means of a non-linear forecasting approach. The analysis of the data in terms of first-differences (secular variation) of the horizontal magnetic components made in phase space with the simplex technique seems to exclude the pre-eminence of any stochastic or periodic behaviour. The dimensionality of the underlying non-linear process and the corresponding largest positive Lyapunov exponent are estimated. The results give some evidence that the geomagnetic field evolves as a non-linear chaotic system with unpredictable behaviour after times greater than a few years, confirming the common practice of updating global models of the geomagnetic field every 5 years.
Appears in Collections:04.01.03. Mantle and Core dynamics
04.05.02. Geomagnetic field variations and reversals
Papers Published / Papers in press

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