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      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. The IGRF is a series of mathematical models of the Earth's main field and its annual rate of change (secular variation).
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          International Geomagnetic Reference Field 11
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          IGRF 11
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              2010-10-12
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              International Association of Geomagnetism and Aeronomy (IAGA)
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                      https://www.ngdc.noaa.gov/IAGA/vmod/igrf.html
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                      International Geomagnetic Reference Field
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                      The International Association of Geomagnetism and Aeronomy (IAGA) has released the 11th Generation International Geomagnetic Reference Field, which is the latest version of a standard mathematical description of the Earth's main magnetic field that is used widely in studies of the Earth's deep interior, its crust and its ionosphere and magnetosphere.
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          Report on the Reference Field. Equations and coefficients for the eleventh generation. DOI: 10.1111/j.1365-246X.2010.04804.x
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