## Locally Supported Wavelets for the Separation of Spherical Vector Fields with Respect to their Sources

• We provide a space domain oriented separation of magnetic fields into parts generated by sources in the exterior and sources in the interior of a given sphere. The separation itself is well-known in geomagnetic modeling, usually in terms of a spherical harmonic analysis or a wavelet analysis that is spherical harmonic based. However, it can also be regarded as a modification of the Helmholtz decomposition for which we derive integral representations with explicitly known convolution kernels. Regularizing these singular kernels allows a multiscale representation of the magnetic field with locally supported wavelets. This representation is applied to a set of CHAMP data for crustal field modeling.

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Author: Christian Gerhards urn:nbn:de:hbz:386-kluedo-16835 Schriften zur Funktionalanalysis und Geomathematik (48) Report English 2011 2011 Technische Universität Kaiserslautern Green’s function; locally supported wavelets; magnetic field; single layer kernel; spherical decomposition Fachbereich Mathematik 510 Mathematik 41A30 Approximation by other special function classes 42C40 Wavelets and other special systems 86A99 Miscellaneous topics

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