Aeromagnetic compensation is essential for the generation of highly accurate data in airborne geophysical surveys. Its objective is the removal of magnetic interference (or noise) in the signals, measured by magnetometer sensors, which is caused by the maneuvering of an aircraft flying within the Earth's magnetic field. These interference effects associated with the airframe of the aircraft, can be divided into three groups (Leliak, 1961): (a) permanent magnetism, from ferromagnetic parts in the aircraft; (b) induced magnetism, created by the Earth's magnetic field in soft iron or paramagnetic parts; and (c) eddy-current magnetic fields, created from electric currents produced on electrically conducting paths of the airframe, directly proportional to the rate of change of the magnetic flux.

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