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- W2094646879 endingPage "505" @default.
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- W2094646879 abstract "Knowledge of the Holocene evolution of Earth's magnetic field is important for understanding geodynamo processes in the core, is necessary for studying long-term solar-terrestrial relationships, and can provide useful age constraints for archeologicaland stratigraphic applications. Continuous time-varying global field models based on archeo- and paleomagnetic data are useful tools in this regard. We use a comprehensive data compilation and recently refined modelling strategies to produce CALS10k.1b, the first time-varying spherical harmonic geomagnetic field model spanning 10 ky. The model is an average obtained from bootstrap sampling to take account of uncertainties in magnetic components and ages in the data (and hence has version number 1b instead of 1). This model shows less spatial and temporal resolution than earlier versions for 0–3 ka, and particularly aims to provide a robust representation of the large-scale field at the core-mantle boundary (CMB). We discuss the geomagnetic dipole evolution and changes in Holocene magnetic field morphology at the CMB as shown by the new reconstruction. The results are compatible with earlier models (CALS3k.3 and CALS3k.4) for 0–3 ka, but reveal some clear deficiencies in the 0–7 ka CALS7K.2 model prior to 3 ka. CALS10k.1b is able to resolve mobile and structurally-evolving high latitude radial field flux lobes at the CMB in both hemispheres, as well as persistent non-zonal structure, in the 10 ky average. Contributions to the average field from time-varying structures in the equatorial Indonesian–Australian region are particularly striking." @default.
- W2094646879 created "2016-06-24" @default.
- W2094646879 creator A5028622834 @default.
- W2094646879 creator A5086145547 @default.
- W2094646879 creator A5087127286 @default.
- W2094646879 creator A5088210428 @default.
- W2094646879 date "2011-12-01" @default.
- W2094646879 modified "2023-09-30" @default.
- W2094646879 title "Reconstructing the Holocene geomagnetic field" @default.
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