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The earth's magnetic field, also known as the geomagnetic field (GMF), is a quasi-static magnetic field that encloses our earth from the South Pole to the North Pole (Figure). It is caused mainly by electric currents in the liquid part of the Earth's core. At the Poles the magnetic field is twice as strong as at the equator. The geomagnetic field depends on the geological depth and latitude; on the Earth surface it ranges from 30-70 µT. Thus, the geomagnetic field is the strongest magnetic field we are continuously exposed to. In relation to the ground, the field lines pass horizontally at the equator und perpendicularly at the Poles. In Central Europe the field lines enter diagonally into the ground. The angle between the horizontal surface of the ground and the field lines is called inclination.