Repeat-station surveys: implications from chaos and ergodicity of the recent geomagnetic field

Angelo De Santis, Enkelejda Qamili, Gianfranco Cianchini

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 and from global predicted and definitive models of differences in the time domain. 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.

 


Keywords


Magnetic repeat stations; Chaos; Ergodicity

Full Text:

PDF

References


DOI: https://doi.org/10.4401/ag-5491
We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it (Read more).
Ok


Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X