The BGS magnetic field candidate models for the 10th generation IGRF

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概要

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• In this paper we describe the derivation of the BGS candidate models for the 10th generation International Geomagnetic Reference Field. Our data set comprised quiet night-time data from the Ørsted and Champ satellites spanning 1999.2-2004.6 and observatory hourly means spanning 1999.0-2004.0. To improve the secular variation estimates for 2005.0-2010.0, predictions based on application of linear prediction filters to long series of observatory annual means were also used. These data were fitted by a spherical harmonic "parent"model with an internal field of maximum degree 36, a quadratic dependence on time up to degree 8, a linear dependence on time up to degree 12, an external field of maximum degree 2 with linear dependence on time, annual and semi-annual variations, and <I>Dst</I> dependence for degree 1 terms. Additionally for the external field, non-zonal degree 1 coefficients in the Geocentric Equatorial Inertial reference frame with annual variations and dependence on the Interplanetary Magnetic Field <I>Y</I> -component are included. The candidate models were then based, for the main field, on an extrapolation to 2005.0 of the truncated parent model, and for the secular variation, on its extrapolation to 2007.5. This latter set of coefficients was then used to generate a synthetic data set at the Earth's surface and this set was augmented with long term linear predictions of observatory annual means, to produce the final candidate secular variation model at 2007.5.

• 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文

著者

• Macmillan Susan

  British Geological Survey

• Lesur Vincent

  British Geological Survey

• THOMSON Alan

  British Geological Survey

• Lesur Vincent

  British Geological Survey, Murchison House

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• The 1995 Revision of the Joint US/UK Geomagnetic Field Models. II : Main Field
• The 1995 Revision of the Joint US/UK Geomagnetic Field Models-I. Secular Variation
• Magnetic Field Maps for IGRF 1995
• International Geomagnetic Reference Field - the eighth generation
• Preface
• An evaluation of candidate geomagnetic field models for IGRF 2000
• Evaluation of candidate geomagnetic field models for the 10th generation of IGRF
• An Evaluation of Candidate Geomagnetic Field Models for DGRF 1990 and IGRF 1995
• The BGS magnetic field candidate models for the 11th generation IGRF
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