Publications

Archeomagnetic results and high resolution sedimentary records have been used to reconstruct the global geomagnetic field for millennial time-scales. Here I present a series of models named CALSxk, Continuous models based on Archeomagnetic and Lake Sediment data of the past x kyrs, and in particular CALS10k.1b, the first regularized spherical harmonic field model for the past 10 kyrs. The effects of uncertainties in both magnetic elements and their ages and of uneven global data distribution are assessed by a bootstrap resampling scheme. I discuss the evolution of the dipole moment and tilt and features of the radial field component at the core-mantle boundary. The model also provides estimates for field directions and intensity for any location at Earth's surface. However, as the presently available data distribution is uneven and strongly biased towards the northern hemisphere and Europe in particular, the accuracy and resolution of global models remains limited. More high resolution lake or marine paleomagnetic sediment records and archeomagnetic results from from the southern hemisphere, e.g. the South American countries, are necessary to improve global field reconstructions.

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Korte, M. (2011): Reconstructing the global geomagnetic field of the Holocene. Latinmag Letters, 1, 2, 1-6.