International Association of Geomagnetism and Aeronomy International Union of Geodesy and Geophysics
Working Group V-MOD: Geomagnetic Field Modelling
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At the 2003 General Assembly in Sapporo, IAGA Division V reorganized. What was formerly Working Group V-8 is now V-MOD: Geomagnetic Field Modeling. The aim of Working Group V-MOD of Division V is to promote and coordinate international efforts to model and analyze the internal geomagnetic field and its secular variation on both global and regional scales. The Working Group holds business meetings and arranges symposiums at IAGA Scientific Assemblies and IUGG General Assemblies. You can read a brief history of WG V-MOD.

The latest International Geomagnetic Reference Field (IGRF-12 ) is released! Download the model file here. The file format remains the same as the previous IGRF coefficient file.

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Home page of WDMAM

12th Generation IGRF - Released December, 2014
The International Association of Geomagnetism and Aeronomy (IAGA) released the 12 th Generation International Geomagnetic Reference Field – the latest version of a standard mathematical description of the Earth's main magnetic field and used widely in studies of the Earth's deep interior, its crust and its ionosphere and magnetosphere. The coefficients for this degree and order 13 main field model were finalized by a task force of IAGA in December 2014. The IGRF is the product of a 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. Before using the IGRF please look at the "Health Warning".

IGRF-12 is also available to download.

Online access to IGRF-12 is also available from the IGRF-12 calculator operated by BGS.

Task Group for the World Digital Magnetic Anomaly Map Project

Chair: Erwan Thébault

Chargé de Recherche
Laboratoire de Planétologie de Géodynamique de Nantes
2, rue de al Houssiniere BP 92208- 44322 Nantes cedex 3 - France
Tel: +33 2 51 12 54 70

Co-Chair: Patrick Alken

National Oceanic and Atmospheric Administration
National Centers for Environmental Information
325 Broadway, E/GC3
Boulder, CO 80305, USA
Tel: +1 303 497 5480

For page content questions please contact: Erwan Thébault
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Revised: 6 July 2015

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