The second generation of the GFZ Reference Internal Magnetic Model: GRIMM-2

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• 作者：V. Lesur ; I. Wardinski ; M. Hamoudi ; M. Rother
• 关键词：Geomagnetism ; core field modeling ; IGRF
• 刊名：Earth, Planets and Space
• 出版年：2010
• 出版时间：October 2010
• 年：2010
• 卷：62
• 期：10
• 页码：765-773
• 全文大小：2390KB
• 参考文献：Lesur, V., I. Wardinski, M. Rother, and M. Mandea, GRIMM鈥擳he GFZ Reference Internal Magnetic Model based on vector satellite and observatory data, Geophys. J. Int., 173, doi:10.1111/j.1365-246X.2008.03724.x, 2008.
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  Olsen, N., R. Haagmans, T. J. Sabaka, A. Kuvshinov, S. Maus, M. E. Purucker, M. Rother, V. Lesur, and M. Mandea, The Swarm End-to-End mission simulator study: Separation of the various contributions to the Earth鈥檚 magnetic field using synthetic data, Earth Planets Space, 58, 359鈥?70, 2006a.CrossRef
  Olsen, N., H. L眉hr, T. Sabaka, M. Mandea, M. Rother, L. T酶ffner-Clausen, and S. Choi, CHAOS鈥擜 model of the Earth鈥檚 magnetic field derived from CHAMP, Oersted, and SAC-C magnetic satellite data, Geophys. J. Int., 166(1), 67鈥?5, doi:10.1111/j.1365-246X.2006.02959.x, 2006b.CrossRef
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  Thomson, A. and V. Lesur, An improved geomagnetic data selection algorithm for global geomagnetic field modelling, Geophys. J. Int., 169, 951鈥?63, doi: 10.1111/j.1365-246X.2007.03354.x, 2007.CrossRef
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• 作者单位：V. Lesur (1)
  I. Wardinski (1)
  M. Hamoudi (1)
  M. Rother (1)
  
  1. Helmholtz Centre Potsdam, GFZ German Research centre for Geosciences, Telegrafenberg, 14473, Germany
  
• 刊物类别：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 刊物主题：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1880-5981

文摘

We present the second generation of the GFZ Reference Internal Magnetic Model (GRIMM-2), that was derived for the preparation of the GFZ candidate for the 11th generation of the IGRF. The model is built by fitting a vector data set made of CHAMP satellite and observatory data, spanning the period 2001.0 to 2009.5. The data selection technique and the model parametrization are similar to that used for the derivation of the GRIMM model (Lesur et al., 2008). The obtained model is robust over the time span of the data. However, the secular variation above spherical harmonic degree 13 becomes less controlled by the data and is constrained by the applied regularization before 2002 and after 2008.5. At best, only the spherical harmonic degrees 3 to 6 are robustly estimated for the secular acceleration. The problem associated with the first two spherical harmonic degrees of the secular acceleration model arise from the difficulty in separating the core field signal from the external fields and their internally induced counterparts. The regularization technique applied smoothes the magnetic field model in time. This affects all spherical harmonic degrees, but starts to be significant at spherical harmonic degree 5. Key words Geomagnetism core field modeling IGRF