Comparison of Germany from repeat station data to a recent global field model

Paper type: 
Oral presentation

Comparison of Germany from repeat station data to a recent global field model

Monika Korte and Vincent Lesur

Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences

 

The German repeat station surveys have been improved since about 10 years by using local variometers for data reductions instead of relying on the assumption that external and induced field variations are the same at any station and the nearest geomagnetic observatory. For nearly the same time interval, magnetic field data obtained from satellites like Ørsted and CHAMP are available with a good coverage of the whole globe. Recent global field models based on these satellite data together with geomagnetic observatory data provide an improved description of the main field and secular variation. We use the data of one such model, the GRIMM2x model by Lesur et al. (2010) to compare the magnetic field and secular variation evolution in Germany predicted by that model between 2000 and 2010 to the repeat station data collected over that time interval. Possible origins of the observed differences in terms of data accuracy and global model resolution are discussed.

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