The geomagnetic secular-variation timescale in observations and numerical dynamo models

The knowledge of the spatial power spectra of the main geomagnetic field and of its secular variation makes it possible to define typical timescales τn for each spherical harmonic degree n. Investigating both observations and numerical dynamos, we show that a one‐parameter law of the form τn = τSV/n...

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Veröffentlicht in:	Geophysical research letters 2011-05, Vol.38 (9), p.np-n/a
Hauptverfasser:	Lhuillier, Florian, Fournier, Alexandre, Hulot, Gauthier, Aubert, Julien
Format:	Artikel
Sprache:	eng
Schlagworte:	correlation times Data assimilation dynamos: theories and simulations Earth Sciences Earth, ocean, space Exact sciences and technology geomagnetic secular variation Geomagnetism Geophysics Law main geomagnetic field models Mathematical models Rotating generators Sciences of the Universe Secular variations Spectra Spherical harmonics statistical behavior
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