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dc.contributorEscuela de Ingenierias Industrial, Informática y Aeroespaciales_ES
dc.contributor.authorBaenas, Tomás
dc.contributor.authorEscapa García, Luis Alberto 
dc.contributor.authorFerrándiz, José Manuel
dc.contributor.otherIngenieria Aeroespaciales_ES
dc.identifier.citationBaenas, T., Escapa, A., & Ferrándiz, J. M. (2020). Nutation of the non-rigid Earth: Effect of the mass redistribution. In Astronomy & Astrophysics (Vol. 643, p. A159). EDP Sciences.
dc.description.abstract[EN] In this research, we computed the nutation of the figure axis for a non-rigid Earth model due to the mass redistribution resulting from the lunisolar attraction on the deformable Earth, thus extending our previous work on the precessional motion. The basic Earth model is a two-layer structure composed of a fluid core and an anelastic mantle. We used the Hamiltonian approach, leading to closed-form analytical formulae that describe the nutations in longitude and obliquity of the figure axis as a sum of Poisson and Oppolzer terms. Those formulae were evaluated assuming different Earth rheologies by means of the Love number formalism. In particular, we first computed the effect using the standard model of the International Earth Rotation and Reference Systems Service Conventions (2010) solid tides, and then the Love numbers computed by Williams and Boggs, accounting for the complete oceanic tide contribution, which should provide more consistent and updated values for the nutations. The main amplitudes correspond to the 18.6 yr nutation component and reach 201 μas and −96 μas in the in-phase components in longitude and obliquity, respectively. The obtained values differ greatly from those considered in the current nutation model, IAU2000, of the International Astronomical Union (IAU) – and later similar studies – which includes this effect under the denomination of non-linear terms and derives its numerical contribution on the basis of the Sasao, Okubo, and Saito framework. The differences are significant and reach more than 30 μas for some nutation amplitudes. They can be likely attributed to several factors: an incomplete modelling of the redistribution potential; a different treatment of the permanent tide; and the use of different oceanic tide models.es_ES
dc.publisherEDP Scienceses_ES
dc.rightsAttribution 4.0 Internacional
dc.subjectIngeniería aeroespaciales_ES
dc.subject.otherCelestial mechanicses_ES
dc.subject.otherMethods: analyticales_ES
dc.subject.otherReference systemses_ES
dc.titleNutation of the non-rigid Earth: Effect of the mass redistributiones_ES
dc.journal.titleAstronomy & Astrophysicses_ES
dc.subject.unesco2507 Geofísicaes_ES
dc.subject.unesco21 Astronomía y Astrofísicaes_ES

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Attribution 4.0 Internacional
Except where otherwise noted, this item's license is described as Attribution 4.0 Internacional