Reproducing kernel and Galerkin’s matrix for the exterior of an ellipsoid: Application in gravity field studies

In the introductory part of the paper the importance of the topic for gravity field studies is outlined. Some concepts and tools often used for the representation of the solution of the respective boundary-value problems are mentioned. Subsequently a weak formulation of Neumann’s problem is consider...

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Bibliographic Details
Published in:Studia geophysica et geodaetica Vol. 55; no. 3; pp. 397 - 413
Main Author: Holota, Petr
Format: Journal Article
Language:English
Published: Dordrecht Springer Netherlands 01.07.2011
Springer Nature B.V
Subjects:
Atmospheric Sciences
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Gravity
Magnetic fields
Matrix
Structural Geology
variational methods
Earth’s gravity field
Green’s functions
reproducing kernels
geodetic boundary-value problems
ISSN:0039-3169, 1573-1626
Online Access:Get full text
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Summary:In the introductory part of the paper the importance of the topic for gravity field studies is outlined. Some concepts and tools often used for the representation of the solution of the respective boundary-value problems are mentioned. Subsequently a weak formulation of Neumann’s problem is considered with emphasis on a particular choice of function basis generated by the reproducing kernel of the respective Hilbert space of functions. The paper then focuses on the construction of the reproducing kernel for the solution domain given by the exterior of an oblate ellipsoid of revolution. First its exact structure is derived by means of the apparatus of ellipsoidal harmonics. In this case the structure of the kernel, similarly as of the entries of Galerkin’s matrix, becomes rather complex. Therefore, an approximation of ellipsoidal harmonics (limit layer approach), based on an approximation version of Legendre’s ordinary differential equation, resulting from the method of separation of variables in solving Laplace’s equation, is used. The kernel thus obtained shows some similar features, which the reproducing kernel has in the spherical case, i.e. for the solution domain represented by the exterior of a sphere. A numerical implementation of the exact structure of the reproducing kernel is mentioned as a driving impulse of running investigations.
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ISSN:0039-3169
1573-1626
DOI:10.1007/s11200-011-0023-4