Forward modeling magnetic fields of induced and remanent magnetization in the lithosphere using tesseroids

摘要: A newly developed software package to calculate the magnetic field in a spherical coordinate system near Earth's surface and on satellite height is shown produce reliable modeling results for global regional applications. The discretization cells of model are uniformly magnetized prisms, so called tesseroids. presented algorithm extends an existing code gravity calculations by applying Poisson's relation identify potential with sum over pseudogravity fields tesseroids.By testing different lithosphere grids it possible determine optimal size tesseroids altitude within realistic measurement error bounds. Also influence ellipticity upon result estimated examples studied.The new calculates induced remanent models at scale. For far-field effects evaluated discussed. This provides bounds minimal that necessary predict meaningful total anomalies corresponding area. Tool computation prisms was developed.Appropriate width 1 or less degrees.Elliptic lithospheric have approximately 2nT difference.15° Extension sufficient avoid big edge effects.