Physics – Geophysics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3809306l&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 9, CiteID L09306
Physics
Geophysics
5
Geomagnetism And Paleomagnetism: Time Variations: Secular And Longer, Geomagnetism And Paleomagnetism: Dynamo: Theories And Simulations, Geomagnetism And Paleomagnetism: Core Processes (1213, 8115), Mathematical Geophysics: Time Series Analysis (1872, 1988, 4277, 4475), Mathematical Geophysics: Inverse Theory
Scientific paper
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 is satisfied for the non-dipole field, given the statistical way the observed τn are expected to fluctuate. Consequently, we determine the corresponding secular-variation timescale τSV from either instantaneous or time-averaged spectra, leading to a value of 415 ±4555 yr for recent satellite field models. In the broader context of geomagnetic data assimilation, τSV could provide a sensible and convenient means to rescale the time axis of dynamo simulations.
Aubert Julien
Fournier Alexandre
Hulot Gauthier
Lhuillier Florian
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