Dictionary:International Geomagnetic Reference Field (IGRF)

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{{#category_index:I|International Geomagnetic Reference Field (IGRF)}} A long wavelength regional magnetic-field model determined by an international committee about every five years (e.g., 1965, 1975, 1980); expected secular changes are included. The model consists of spherical harmonics. The IGRF is subtracted from observed data to determine the local field.