Precession-nutation and the Earth's dynamical flattening
dc.contributor.author | CAPITAINE, N. | |
hal.structure.identifier | Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB] | |
hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
dc.contributor.author | BOURDA, G. | |
dc.contributor.author | ZERHOUNI, W. | |
dc.date.conference | 2007-04-16 | |
dc.description.abstractEn | From the observed precession of the equator, the luni-solar precession can be deduced by accounting for the direct and indirect planetary effects, for the J_2-tilt effect, for the geodesic precession, for the second order terms called nutation-on-nutation. The luni-solar precession, in turn, is related to the Moon and Sun ephemerides, and this relations depends on the global Earth dynamical flattening H. This is the way one can get a numerical value for H from the observed precession. On the other hand, the dynamical flattening is related to the Earth's main moments of inertia. There is a 1 percent difference between the value of H computed for an Earth model (as PREM) with hydrostatic equilibrium and the observed value. We show here that this difference is solved by adding in the computation of H the mass anomalies inside the mantle as given by seismic tomography and those associated with the flow-induced boundary displacements. | |
dc.language.iso | en | |
dc.title.en | Precession-nutation and the Earth's dynamical flattening | |
dc.type | Communication dans un congrès | |
dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP] | |
bordeaux.country | AT | |
bordeaux.conference.city | Vienne | |
bordeaux.peerReviewed | oui | |
hal.identifier | hal-00401059 | |
hal.version | 1 | |
hal.invited | non | |
hal.proceedings | non | |
hal.conference.end | 2007-04-20 | |
hal.popular | non | |
hal.audience | Non spécifiée | |
hal.origin.link | https://hal.archives-ouvertes.fr//hal-00401059v1 | |
bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.au=CAPITAINE,%20N.&BOURDA,%20G.&ZERHOUNI,%20W.&rft.genre=unknown |
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