Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8683
Authors: De Santis, A.* 
Qamili, E.* 
Cianchini, G.* 
Title: Repeat-station surveys: implications from chaos and ergodicity of the recent geomagnetic field
Issue Date: 18-Apr-2013
Series/Report no.: 1 / 56 (2013)
DOI: 10.4401/ag-5491
URI: http://hdl.handle.net/2122/8683
Keywords: Geomagnetic field
Repeat Stations
Ergodicity
Chaos
Subject Classification04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional models 
04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field 
04. Solid Earth::04.05. Geomagnetism::04.05.08. Instruments and techniques 
05. General::05.01. Computational geophysics::05.01.04. Statistical analysis 
05. General::05.05. Mathematical geophysics::05.05.99. General or miscellaneous 
Abstract: The present geomagnetic field is chaotic and ergodic: chaotic because it can no longer be predicted beyond around 6 years; and ergodic in the sense that time averages correspond to phase-space averages. These properties have already been deduced from complex analyses of observatory time series in a reconstructed phase space [Barraclough and De Santis 1997] and from global predicted and definitive models of differences in the time domain [De Santis et al. 2011]. These results imply that there is a strong necessity to make repeat-station magnetic surveys more frequently than every 5 years. This, in turn, will also improve the geomagnetic field secular variation models. This report provides practical examples and case studies.
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