An analysis of the fluctuations of the geomagnetic dipole

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dc.creatorBrendel, K.
dc.creatorKuipers, J.
dc.creatorBarkema, G. T.
dc.creatorHoyng, P.
dc.date2007-07-04
dc.date.accessioned2026-07-07T08:13:58Z
dc.date.available2026-07-07T08:13:58Z
dc.descriptionThe time evolution of the strength of the Earth's virtual axial dipole moment (VADM) is analyzed by relating it to the Fokker-Planck equation, which describes a random walk with VADM-dependent drift and diffusion coefficients. We demonstrate first that our method is able to retrieve the correct shape of the drift and diffusion coefficients from a time series generated by a test model. Analysis of the Sint-2000 data shows that the geomagnetic dipole mode has a linear growth time of 13 to 33 kyr, and that the nonlinear quenching of the growth rate follows a quadratic function of the type [1-(x/x0)^2]. On theoretical grounds, the diffusive motion of the VADM is expected to be driven by multiplicative noise, and the corresponding diffusion coefficient to scale quadratically with dipole strength. However, analysis of the Sint-2000 VADM data reveals a diffusion which depends only very weakly on the dipole strength. This may indicate that the magnetic field quenches the amplitude of the turbulent velocity in the Earth's outer core.
dc.description11 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0707.0623
dc.identifierhttp://arxiv.org/abs/0707.0623
dc.identifierPhys. Earth Planet. Inter. 162 (2007) 249-255
dc.identifierdoi:10.1016/j.pepi.2007.05.005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/132957
dc.subjectGeophysics
dc.titleAn analysis of the fluctuations of the geomagnetic dipole
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