Maps on in this webservice are produced using the International Geomagnetic Reference Field (IGRF), 14th Generation, as released in Dec 2024.
Values are computed at mean sea-level (h=0) for every year spanning 1900-2030. Each magnetic field component can be shown.
Pure Python International Geomagnetic Reference Field (PPIGRF) was used to compute field values.
The IGRF is a model of the Earth's main magnetic field that is updated every 5 years; the first version of the IGRF was created in 1965
The creation and updating of the IGRF is a collaborative project involving many countries, research institutions, and scientific organizations.
The British Geological Survey plays an important role in updating the IGRF and provides an online calculator
The geomagnetic dip pole is the location on Earth's surface where the geomagnetic field points exactly vertically (i.e. perpendicular to the surface). It slowly moves over time due to changes in Earth's magnetic field.