Untersuchungen von Feldumkehrungen an einem numerischen Modell des Geodynamos: Field reversals in a numerical model of the geodynamo
One of the most interesting aspects of the Earth's magnetic field is that it changes its polarity on geological time scales. In the last 160 million years, such field reversals occurred several times per million years, but with a very variable frequency. After a reversal, the magnetic north pol...
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| Language: | German |
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Niedersächsische Staats- und Universitätsbibliothek
2003
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| Online Access: | http://webdoc.sub.gwdg.de/diss/2003/kutzner/index.html http://resolver.sub.uni-goettingen.de/purl/?webdoc-482 http://nbn-resolving.de/urn:nbn:de:gbv:7-webdoc-482-2 |
| Summary: | One of the most interesting aspects of the Earth's magnetic field is that it changes its polarity on geological time scales. In the last 160 million years, such field reversals occurred several times per million years, but with a very variable frequency. After a reversal, the magnetic north pole has more or less exchanged its place with the magnetic south pole. The internal magnetic field is generated within the liquid iron core of the Earth in a self-sustained dynamo process. The physical equations that govern this process can nowadays be solved numerically on high performance computers. The simulations reproduce the principal characteristics of the Earth's field quite nicely, e. g. the dominance of the dipole field, the magnetic flux concentrations at the core-mantle-boundary (CMB) and the westward drift of magnetic structures. However, reversals of the field are not a common feature of the models and it is unclear what conditions are required for obtaining them Sprache der Zusammenfassung: Englisch @Göttingen, Univ., Diss., 2003 |
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