The Scalar Boundary Conditions For The Motion Of The Elastic Earth To Second Order In Ellipticity |
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Authors: | Huang Cheng-Li |
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Institution: | (1) Shanghai Astronomical Observatory, NAO, Chinese Academy of Sciences, United Center for Astrogeodynamics Research, Chinese Academy of Sciences, Shanghai, 200030, P.R. China |
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Abstract: | The scalar equations of infinitesimal elastic gravitational motion for a rotating, slightly elliptical Earth are always used
to study the Earth's nutation and tides theoretically, while the determination of the integration of the equations depends,
to a certain extent, on the choice of a set of appropriate boundary conditions. In this paper, a continuity quantity related
to the displacement is first transformed from the elliptical reference boundary to the corresponding effective spherical domain,
and then converted from a vector (or tensor) form to a scalar form by generalized surface spherical harmonics expansion. All
the related components, including the displacement vector field (or the stress tensor field), are then decomposed into the
poloidal and toroidal field using the symmetry restrictions on the normal mode eigenfunctions. After truncation, the boundary
conditions are finally derived, in a scalar ordinary differential form. The process of the derivation is second order in ellipticity
and in full detail. Moreover, the other boundary conditions are also presented as second order in ellipticity at the end of
this paper.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Boundary condition Earth rotation nutation |
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