Abstract
The 12th generation of the International Geomagnetic Reference Field (IGRF) was adopted in December 2014 by the Working Group V-MOD appointed by the International Association of Geomagnetism and Aeronomy (IAGA). It updates the previous IGRF generation with a definitive main field model for epoch 2010.0, a main field model for epoch 2015.0, and a linear annual predictive secular variation model for 2015.0-2020.0. Here, we present the equations defining the IGRF model, provide the spherical harmonic coefficients, and provide maps of the magnetic declination, inclination, and total intensity for epoch 2015.0 and their predicted rates of change for 2015.0-2020.0. We also update the magnetic pole positions and discuss briefly the latest changes and possible future trends of the Earth’s magnetic field.
Highlights
The International Geomagnetic Reference Field (IGRF) is a series of mathematical models describing the large-scale internal part of the Earth’s magnetic field between epochs 1900 A.D. and the present
The IGRF model must be regularly revised in order to follow the continuous temporal changes of the geomagnetic field generated in the Earth’s outer core
An IGRF model, is non-definitive - it will eventually be replaced by a definitive model in a future revision of the IGRF
Summary
Erwan Thébault1*, Christopher C Finlay, Ciarán D Beggan, Patrick Alken, Julien Aubert, Olivier Barrois, Francois Bertrand, Tatiana Bondar, Axel Boness, Laura Brocco, Elisabeth Canet, Aude Chambodut, Arnaud Chulliat, Pierdavide Coïsson, François Civet, Aimin Du13, Alexandre Fournier, Isabelle Fratter, Nicolas Gillet, Brian Hamilton, Mohamed Hamoudi, Gauthier Hulot, Thomas Jager, Monika Korte, Weijia Kuang, Xavier Lalanne, Benoit Langlais, Jean-Michel Léger, Vincent Lesur, Frank J Lowes, Susan Macmillan, Mioara Mandea, Chandrasekharan Manoj, Stefan Maus, Nils Olsen, Valeriy Petrov, Victoria Ridley, Martin Rother, Terence J Sabaka, Diana Saturnino, Reyko Schachtschneider, Olivier Sirol, Andrew Tangborn, Alan Thomson, Lars Tøffner-Clausen, Pierre Vigneron, Ingo Wardinski and Tatiana Zvereva
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