dorsal/arxiv
View SchemaReversals in nature and the nature of reversals
| Authors | Frank Stefani, Mingtian Xu, Luca Sorriso-Valvo, Gunter Gerbeth, Uwe Günther |
|---|---|
| Categories | |
| ArXiv ID | physics/0701026 |
| URL | https://arxiv.org/abs/physics/0701026 |
| DOI | 10.1080/03091920701523311 |
| Journal | Geophys.Astrophys.Fluid Dynamics.101:227-248,2007 |
Abstract
The asymmetric shape of reversals of the Earth's magnetic field indicates a possible connection with relaxation oscillations as they were early discussed by van der Pol. A simple mean-field dynamo model with a spherically symmetric $\alpha$ coefficient is analysed with view on this similarity, and a comparison of the time series and the phase space trajectories with those of paleomagnetic measurements is carried out. For highly supercritical dynamos a very good agreement with the data is achieved. Deviations of numerical reversal sequences from Poisson statistics are analysed and compared with paleomagnetic data. The role of the inner core is discussed in a spectral theoretical context and arguments and numerical evidence is compiled that the growth of the inner core might be important for the long term changes of the reversal rate and the occurrence of superchrons.
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"abstract": "The asymmetric shape of reversals of the Earth\u0027s magnetic field indicates a\npossible connection with relaxation oscillations as they were early discussed\nby van der Pol. A simple mean-field dynamo model with a spherically symmetric\n$\\alpha$ coefficient is analysed with view on this similarity, and a comparison\nof the time series and the phase space trajectories with those of paleomagnetic\nmeasurements is carried out. For highly supercritical dynamos a very good\nagreement with the data is achieved. Deviations of numerical reversal sequences\nfrom Poisson statistics are analysed and compared with paleomagnetic data. The\nrole of the inner core is discussed in a spectral theoretical context and\narguments and numerical evidence is compiled that the growth of the inner core\nmight be important for the long term changes of the reversal rate and the\noccurrence of superchrons.",
"arxiv_id": "physics/0701026",
"authors": [
"Frank Stefani",
"Mingtian Xu",
"Luca Sorriso-Valvo",
"Gunter Gerbeth",
"Uwe G\u00fcnther"
],
"categories": [
"physics.geo-ph",
"astro-ph",
"physics.flu-dyn"
],
"doi": "10.1080/03091920701523311",
"journal_ref": "Geophys.Astrophys.Fluid Dynamics.101:227-248,2007",
"title": "Reversals in nature and the nature of reversals",
"url": "https://arxiv.org/abs/physics/0701026"
},
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