Abstract
Abstract The International Geomagnetic Reference Field (IGRF) 10th Generation was adopted in 2004 by the International Association of Geomagnetism and Aeronomy (IAGA) Working Group V-MOD. It is the latest version of a standard mathematical description of the Earth’s main magnetic field and is used widely in studies of the Earth’s deep interior, its crust and its ionosphere and magnetosphere. This generation differs from the previous generation with the replacement of the secular-variation model for 2000.0–2005.0 with a main-field model at 2005.0 and a secular-variation model for 2005.0–2010.0. The IGRF is the product of a huge collaborative effort between magnetic field modellers and the institutes involved in collecting and disseminating magnetic field data from satellites and from observatories and surveys around the world. This paper lists the new coefficients and includes contour maps and pole positions.
Highlights
The International Geomagnetic Reference Field (IGRF) is an internationally agreed series of global spherical harmonic models of the Earth’s magnetic field whose sources are mainly in the Earth’s core
The coefficients are functions of time and for the IGRF they are assumed to vary at constant rates for five-year intervals
The first generation of the IGRF was available in 1969, and this current revision is the 10th generation of the IGRF
Summary
The IGRF is an internationally agreed series of global spherical harmonic models of the Earth’s magnetic field whose sources are mainly in the Earth’s core. For more details on main-field modelling the reader is referred to Chapman and Bartels (1940) and Langel (1987). The new constituent models are a main-field model for 2005.0 and a secular-variation model for 2005.0–2010.0. The call for candidate main-field models at epoch 2005.0 to maximum degree 13 and for annual secular-variation models to maximum degree 8 for 2005.0–2010.0 went out in March 2004 from the chairman, Stefan Maus, of the IAGA Working Group V-MOD Task Force and in response, models were received in October 2004 from four teams.
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