Journal of geophysical research : Solid Earth / American Geophysical Union . vol 108 n° 5Paru le : 01/05/2003 |
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Ajouter le résultat dans votre panierRemaining error sources in the nutation at the submilliarc second level / Véronique Dehant in Journal of geophysical research : Solid Earth, vol 108 n° 5 (May 2003)
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Titre : Remaining error sources in the nutation at the submilliarc second level Type de document : Article/Communication Auteurs : Véronique Dehant, Auteur ; Martine Feissel-Vernier , Auteur ; Olivier de Viron, Auteur ; C. Ma, Auteur ; D.T. Yseboodt, Auteur ; Christian Bizouard, Auteur Année de publication : 2003 Article en page(s) : pp 13-1 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] interférométrie à très grande base
[Termes IGN] nutationRésumé : (auteur) Earth's precession and nutations are mainly generated by the luni-solar tidal torque. Diurnal retrograde variations in the atmospheric and oceanic angular momenta in an Earth-fixed reference system induce some additional nutation motions. Observed precession and nutations are derived from very long baseline interferometry (VLBI) data, assuming that the direction of the observed quasars are fixed in space. In this study, we consider the effects of two possible causes for explaining discrepancies between the observed nutations and those modeled in MHB2000 (model adopted by the International Astronomical Union): (1) the time variations in the atmospheric (and potentially oceanic) forcing of the nutations, of the free core nutation (FCN), and of the free inner core nutation (FICN), and (2) the possible contamination of VLBI-derived nutation amplitudes by apparent changes in the directions of the extragalactic radio sources. The robustness of MHB2000 is tested by perturbing some of the parameters and assessing the validity of the resulting nutation amplitudes against realistic estimations. We show that even allowing for large discrepancies related to atmospheric forcing, the ranges of the possible changes in the FCN and FICN periods and damping factors are small. Numéro de notice : A2003-472 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1029/2002JB001763 Date de publication en ligne : 24/05/2003 En ligne : https://doi.org/10.1029/2002JB001763 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102730
in Journal of geophysical research : Solid Earth > vol 108 n° 5 (May 2003) . - pp 13-1[article]