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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 | Journal: | Annals of Geophysics | Series/Report no.: | 1 / 56 (2013) | Publisher: | INGV | Issue Date: | 18-Apr-2013 | DOI: | 10.4401/ag-5491 | Keywords: | Geomagnetic field Repeat Stations Ergodicity Chaos |
Subject Classification: | 04. 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. |
Appears in Collections: | Article published / in press |
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De Santis etal_Annals2013.pdf | 644.36 kB | Adobe PDF | View/Open |
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