Towards Understanding the Interconnection between Celestial Pole Motion and Earth’s Magnetic Field Using Space Geodetic Techniques

The understanding of forced temporal variations in celestial pole motion (CPM) could bring us significantly closer to meeting the accuracy goals pursued by the Global Geodetic Observing System (GGOS) of the International Association of Geodesy (IAG), i.e., 1 mm accuracy and 0.1 mm/year stability on...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Sadegh Modiri, Robert Heinkelmann, Santiago Belda, Zinovy Malkin, Mostafa Hoseini, Monika Korte, José M. Ferrándiz, Harald Schuh
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	celestial pole offset geomagnetic field VLBI Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/7fd4e97b144e4aadab96ec544a042a05
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:7fd4e97b144e4aadab96ec544a042a05
record_format	dspace
spelling	oai:doaj.org-article:7fd4e97b144e4aadab96ec544a042a052021-11-25T18:57:25ZTowards Understanding the Interconnection between Celestial Pole Motion and Earth’s Magnetic Field Using Space Geodetic Techniques10.3390/s212275551424-8220https://doaj.org/article/7fd4e97b144e4aadab96ec544a042a052021-11-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/22/7555https://doaj.org/toc/1424-8220The understanding of forced temporal variations in celestial pole motion (CPM) could bring us significantly closer to meeting the accuracy goals pursued by the Global Geodetic Observing System (GGOS) of the International Association of Geodesy (IAG), i.e., 1 mm accuracy and 0.1 mm/year stability on global scales in terms of the Earth orientation parameters. Besides astronomical forcing, CPM excitation depends on the processes in the fluid core and the core–mantle boundary. The same processes are responsible for the variations in the geomagnetic field (GMF). Several investigations were conducted during the last decade to find a possible interconnection of GMF changes with the length of day (LOD) variations. However, less attention was paid to the interdependence of the GMF changes and the CPM variations. This study uses the celestial pole offsets (CPO) time series obtained from very long baseline interferometry (VLBI) observations and data such as spherical harmonic coefficients, geomagnetic jerk, and magnetic field dipole moment from a state-of-the-art geomagnetic field model to explore the correlation between them. In this study, we use wavelet coherence analysis to compute the correspondence between the two non-stationary time series in the time–frequency domain. Our preliminary results reveal interesting common features in the CPM and GMF variations, which show the potential to improve the understanding of the GMF’s contribution to the Earth’s rotation. Special attention is given to the corresponding signal between FCN and GMF and potential time lags between geomagnetic jerks and rotational variations.Sadegh ModiriRobert HeinkelmannSantiago BeldaZinovy MalkinMostafa HoseiniMonika KorteJosé M. FerrándizHarald SchuhMDPI AGarticlecelestial pole offsetgeomagnetic fieldVLBIChemical technologyTP1-1185ENSensors, Vol 21, Iss 7555, p 7555 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	celestial pole offset geomagnetic field VLBI Chemical technology TP1-1185
spellingShingle	celestial pole offset geomagnetic field VLBI Chemical technology TP1-1185 Sadegh Modiri Robert Heinkelmann Santiago Belda Zinovy Malkin Mostafa Hoseini Monika Korte José M. Ferrándiz Harald Schuh Towards Understanding the Interconnection between Celestial Pole Motion and Earth’s Magnetic Field Using Space Geodetic Techniques
description	The understanding of forced temporal variations in celestial pole motion (CPM) could bring us significantly closer to meeting the accuracy goals pursued by the Global Geodetic Observing System (GGOS) of the International Association of Geodesy (IAG), i.e., 1 mm accuracy and 0.1 mm/year stability on global scales in terms of the Earth orientation parameters. Besides astronomical forcing, CPM excitation depends on the processes in the fluid core and the core–mantle boundary. The same processes are responsible for the variations in the geomagnetic field (GMF). Several investigations were conducted during the last decade to find a possible interconnection of GMF changes with the length of day (LOD) variations. However, less attention was paid to the interdependence of the GMF changes and the CPM variations. This study uses the celestial pole offsets (CPO) time series obtained from very long baseline interferometry (VLBI) observations and data such as spherical harmonic coefficients, geomagnetic jerk, and magnetic field dipole moment from a state-of-the-art geomagnetic field model to explore the correlation between them. In this study, we use wavelet coherence analysis to compute the correspondence between the two non-stationary time series in the time–frequency domain. Our preliminary results reveal interesting common features in the CPM and GMF variations, which show the potential to improve the understanding of the GMF’s contribution to the Earth’s rotation. Special attention is given to the corresponding signal between FCN and GMF and potential time lags between geomagnetic jerks and rotational variations.
format	article
author	Sadegh Modiri Robert Heinkelmann Santiago Belda Zinovy Malkin Mostafa Hoseini Monika Korte José M. Ferrándiz Harald Schuh
author_facet	Sadegh Modiri Robert Heinkelmann Santiago Belda Zinovy Malkin Mostafa Hoseini Monika Korte José M. Ferrándiz Harald Schuh
author_sort	Sadegh Modiri
title	Towards Understanding the Interconnection between Celestial Pole Motion and Earth’s Magnetic Field Using Space Geodetic Techniques
title_short	Towards Understanding the Interconnection between Celestial Pole Motion and Earth’s Magnetic Field Using Space Geodetic Techniques
title_full	Towards Understanding the Interconnection between Celestial Pole Motion and Earth’s Magnetic Field Using Space Geodetic Techniques
title_fullStr	Towards Understanding the Interconnection between Celestial Pole Motion and Earth’s Magnetic Field Using Space Geodetic Techniques
title_full_unstemmed	Towards Understanding the Interconnection between Celestial Pole Motion and Earth’s Magnetic Field Using Space Geodetic Techniques
title_sort	towards understanding the interconnection between celestial pole motion and earth’s magnetic field using space geodetic techniques
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7fd4e97b144e4aadab96ec544a042a05
work_keys_str_mv	AT sadeghmodiri towardsunderstandingtheinterconnectionbetweencelestialpolemotionandearthsmagneticfieldusingspacegeodetictechniques AT robertheinkelmann towardsunderstandingtheinterconnectionbetweencelestialpolemotionandearthsmagneticfieldusingspacegeodetictechniques AT santiagobelda towardsunderstandingtheinterconnectionbetweencelestialpolemotionandearthsmagneticfieldusingspacegeodetictechniques AT zinovymalkin towardsunderstandingtheinterconnectionbetweencelestialpolemotionandearthsmagneticfieldusingspacegeodetictechniques AT mostafahoseini towardsunderstandingtheinterconnectionbetweencelestialpolemotionandearthsmagneticfieldusingspacegeodetictechniques AT monikakorte towardsunderstandingtheinterconnectionbetweencelestialpolemotionandearthsmagneticfieldusingspacegeodetictechniques AT josemferrandiz towardsunderstandingtheinterconnectionbetweencelestialpolemotionandearthsmagneticfieldusingspacegeodetictechniques AT haraldschuh towardsunderstandingtheinterconnectionbetweencelestialpolemotionandearthsmagneticfieldusingspacegeodetictechniques
_version_	1718410472367063040

Towards Understanding the Interconnection between Celestial Pole Motion and Earth’s Magnetic Field Using Space Geodetic Techniques

Ejemplares similares