M. Korte and C. G. Constable
Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA
Geomagnetic field models, which allow the mapping of the the field at the core-mantle boundary (CMB) and the visualization of the non-dipole features, have become a useful tool for the investigation of magnetic secular variation and the dynamics of Earth's core. A dataset compiled from archaeomagnetic, lava flow and lake sediment paleomagnetic records at 100 year intervals had been used by Constable et al.(2000) to develop snapshot models of the magnetic field for the last 3000 years. We now present a temporally continuous, thus more consistent model from those data. A comparison for the overlapping centuries to GUFM (Jackson et al.,2000), a continuous field model for the last 400 years from historical and recent data, confirms that reliable models can be produced from the archaeo- and paleomagnetic data. We discuss features seen in the model and point out some limitations of the dataset. However, this model is only a preliminary one as we are working on an expansion of the dataset, in particular the supplementation of the directional data by intensity data.