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| Titel |
A theory of the Earth's magnetic field and of sunspots, based on a self-excited dynamo incorporating the Hall effect |
| VerfasserIn |
A. Paor |
| 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 ; 8, no. 4/5 ; Nr. 8, no. 4/5, S.265-279 |
| Datensatznummer |
250005299
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| Publikation (Nr.) |
 copernicus.org/npg-8-265-2001.pdf |
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| Zusammenfassung |
| A new viewpoint on
the generation and maintenance of the Earth's magnetic field is put
forward, which integrates self-exciting dynamo theory with the possibility
of energy coupling along orthogonal axes provided by the Hall effect. A
nonlinear third-order system is derived, with a fourth equation serving as
an observer of unspecified geophysical processes which could result in
field reversal. Lyapunov analysis proves that chaos is not intrinsic to
this system. Relative constancy of one of the variables produces pseudo
equilibrium in a second order subsystem and allows for self-excitation of
the geomagnetic field. Electromagnetic analysis yields expressions for key
parameters. Models for secular variations recorded at London, Palermo and
at the Cape of Good Hope over the past four hundred years are offered.
Offset of the Earth's magnetic axis from the geographic axis is central
to time-varying declination, but its causes have not yet been established.
Applicability of the model to the explanation of sunspot activity is
outlined. A corroborating experiment published by Peter Barlow in 1831 is
appended. |
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