Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
207-220
Description:
JCR Journal
Description:
reserved
Keywords:
geomagnetic field
;
chaos
;
non-linear forecasting approach
;
04. Solid Earth::04.01. Earth Interior::04.01.03. Mantle and Core dynamics
;
04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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