3D reduction of satellite magnetic measurements to obtain magnetic anomaly coverage over Europe

Vector and scalar magnetic anomaly maps have been determined from Magsat data on a spherical grid (35–60° in latitude and 10–30° in longitude) at an altitude of 400 km over the European region. These anomaly maps have been derived using Gaussian and Laplacian weight functions to interpolate the vector and scalar anomaly data. The parameter value of the Gaussian and Laplacian weight functions controls the cut-off wavelength (the shortest wavelength) processed by the interpolation procedures. This parameter value has been determined from the power spectrum of the vector and scalar anomalies of 12 pass sections, covering the European region. The shortest wavelengths for the derivation of the vector and scalar magnetic anomalies have been set at 1000 and 2000 km, respectively. The derived delta X, delta Y, delta Z and delta T maps reflect the regional magnetic anomalies of the European region at the altitude of the Magsat.