The measurement of gradients of the earth's magnetic field from an airborne platform has been advocated for many years. In 1954 Wickerham proposed the use of what is essentially a gradient along the flight direction (longitudinal gradient). Hood's 1965 suggestion was to measure the vertical gradient using a total-field magnetometer mounted in a tail stinger and a second magnetometer in a towed bird below the tail stinger. In fact, the system finally built by Hood's group at the Geological Survey of Canada used two tail stingers separated by 2 m. The advantages of this type of total-field vertical gradiometry were...
Gridding aeromagnetic data using longitudinal and transverse horizontal gradients with the minimum curvature operator
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Michael D. O'Connell, Richard S. Smith, Marc A. Vallee; Gridding aeromagnetic data using longitudinal and transverse horizontal gradients with the minimum curvature operator. The Leading Edge ; 24 (2): 142–145. doi: https://doi.org/10.1190/1.1876036
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