Lights and shadows on the resonant modes of the Earth rotation axis

Autores
Bizouard, C.; Dehant, V.; Folgueira, M.
Año de publicación
2025
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Resonant free modes are of primary important for understanding the terrestrial and celestial oscillations of the rotation axis of a non-rigid Earth. In this talk we present the state of the art of their observation and modeling. We show how mass transports taking place in the hydro-atmospheric layer allows to reconstruct Chandler wobble from the 1950’s, and account in particular for its minimum observed since the 2020. In contrast, the irregularities of the free core nutation remains largely unexplained. Until now, diurnal circulation in the atmosphere and oceans seems to have been powerless, and we shall give the last results in this respect. Finally we shall explore the existence of a supplementary polar motion resonance caused by the inner core.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Free rotational modes
Chandler wobble
Free core nutation
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-nd/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/192034
Acceder
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spelling Lights and shadows on the resonant modes of the Earth rotation axisBizouard, C.Dehant, V.Folgueira, M.Ciencias AstronómicasFree rotational modesChandler wobbleFree core nutationResonant free modes are of primary important for understanding the terrestrial and celestial oscillations of the rotation axis of a non-rigid Earth. In this talk we present the state of the art of their observation and modeling. We show how mass transports taking place in the hydro-atmospheric layer allows to reconstruct Chandler wobble from the 1950’s, and account in particular for its minimum observed since the 2020. In contrast, the irregularities of the free core nutation remains largely unexplained. Until now, diurnal circulation in the atmosphere and oceans seems to have been powerless, and we shall give the last results in this respect. Finally we shall explore the existence of a supplementary polar motion resonance caused by the inner core.Facultad de Ciencias Astronómicas y Geofísicas2025-08info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/192034enginfo:eu-repo/semantics/reference/url/https://sedici.unlp.edu.ar/handle/10915/190232info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2026-03-26T09:21:46Zoai:sedici.unlp.edu.ar:10915/192034Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292026-03-26 09:21:46.949SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Lights and shadows on the resonant modes of the Earth rotation axis
title Lights and shadows on the resonant modes of the Earth rotation axis
spellingShingle Lights and shadows on the resonant modes of the Earth rotation axis
Bizouard, C.
Ciencias Astronómicas
Free rotational modes
Chandler wobble
Free core nutation
title_short Lights and shadows on the resonant modes of the Earth rotation axis
title_full Lights and shadows on the resonant modes of the Earth rotation axis
title_fullStr Lights and shadows on the resonant modes of the Earth rotation axis
title_full_unstemmed Lights and shadows on the resonant modes of the Earth rotation axis
title_sort Lights and shadows on the resonant modes of the Earth rotation axis
dc.creator.none.fl_str_mv Bizouard, C.
Dehant, V.
Folgueira, M.
author Bizouard, C.
author_facet Bizouard, C.
Dehant, V.
Folgueira, M.
author_role author
author2 Dehant, V.
Folgueira, M.
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Free rotational modes
Chandler wobble
Free core nutation
topic Ciencias Astronómicas
Free rotational modes
Chandler wobble
Free core nutation
dc.description.none.fl_txt_mv Resonant free modes are of primary important for understanding the terrestrial and celestial oscillations of the rotation axis of a non-rigid Earth. In this talk we present the state of the art of their observation and modeling. We show how mass transports taking place in the hydro-atmospheric layer allows to reconstruct Chandler wobble from the 1950’s, and account in particular for its minimum observed since the 2020. In contrast, the irregularities of the free core nutation remains largely unexplained. Until now, diurnal circulation in the atmosphere and oceans seems to have been powerless, and we shall give the last results in this respect. Finally we shall explore the existence of a supplementary polar motion resonance caused by the inner core.
Facultad de Ciencias Astronómicas y Geofísicas
description Resonant free modes are of primary important for understanding the terrestrial and celestial oscillations of the rotation axis of a non-rigid Earth. In this talk we present the state of the art of their observation and modeling. We show how mass transports taking place in the hydro-atmospheric layer allows to reconstruct Chandler wobble from the 1950’s, and account in particular for its minimum observed since the 2020. In contrast, the irregularities of the free core nutation remains largely unexplained. Until now, diurnal circulation in the atmosphere and oceans seems to have been powerless, and we shall give the last results in this respect. Finally we shall explore the existence of a supplementary polar motion resonance caused by the inner core.
publishDate 2025
dc.date.none.fl_str_mv 2025-08
dc.type.none.fl_str_mv info:eu-repo/semantics/conferenceObject
info:eu-repo/semantics/publishedVersion
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dc.language.none.fl_str_mv eng
language eng
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dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
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