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| Titel |
Shannon information of the geomagnetic field for the past 7000 years |
| VerfasserIn |
A. Santis, E. Qamili |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 17, no. 1 ; Nr. 17, no. 1 (2010-02-12), S.77-84 |
| Datensatznummer |
250013638
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| Publikation (Nr.) |
 copernicus.org/npg-17-77-2010.pdf |
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| Zusammenfassung |
| The present behaviour of the geomagnetic field as expressed by the
International Geomagnetic Reference Field (IGRF) deserves special attention
when compared with that shown over the past few thousands of years by two
paleomagnetic/archeomagnetic models, CALS3K and CALS7K. The application of
the Information theory in terms of Shannon Information and K-entropy to these
models shows characteristics of an instable geomagnetic field. Although the
result is mitigated when we correct the CALS7K model for its typical spectral
damping, the present geomagnetic field as represented by IGRF is still rather
distinct, at least for the past 4000 years, a result that is further
confirmed by the CALS3K model. This is consistent with a significant global
critical state started at around 1750, and still present, characterised by
significant decays of the geomagnetic dipole, energy and Shannon information
and high K-entropy. The details of how these characteristics may develop are
not clear, since the present state could move toward an excursion or a
geomagnetic polarity reversal, but we cannot exclude the possibility that the
"critical" behaviour will become again more "normal", stopping the
apparent trend of the recent geomagnetic field decay. |
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