scholarly journals Análise do eixo de rotação da terra no Japão considerando a ocorrência de terremoto ocorrido em março de 2011

2021 ◽  
Vol 11 (2) ◽  
pp. 133-137
Author(s):  
Breno Eduardo dos Santos Alves ◽  
Alexandre Santos Fernandes Filho ◽  
Hellem Cristina Teixeira Rodrigues ◽  
Marcus Vinicius Zamorim da Costa ◽  
Rayssa Soares da Silva ◽  
...  
Keyword(s):  
Earth Rotation ◽  
Reference Systems ◽  
International Earth Rotation

Objetivou-se analisar o eixo de rotação da terra no período superior a um ano, considerando a ocorrência de um fenômeno natural, como o terremoto do Japão ocorrido em março de 2011, para saber se o mesmo contribuiu para alterar o eixo de rotação da Terra e quais as variações sofridas durante o período de estudo. Foram coletados os dados na página oficial do IERS (International Earth Rotation and Reference Systems Service) os dados de orientação da Terra, que são encontrados nos Boletins B, enumerados e coletados no intervalo do boletim B 278 até boletim B 285, que representam o período de setembro de 2010 a setembro de 2011. Com o uso do Excel 2016, tabelou-se e organizaram-se os dados, os quais se referem ao movimento do polo de x e y na unidade de milésimo de segundo (mas). Feito a organização, houve a criação do gráfico no próprio software. As figuras expostas demonstram que as oscilações obedeceram ao padrão cíclico do Movimento de Chandler, de modo que é possível inferir que, apesar da magnitude do evento, não houve interferência sobre o movimento analisado.

scholarly journals Relativity in the IERS Conventions

2009 ◽  
Vol 5 (S261) ◽  
pp. 16-21
Author(s):  
Gérard Petit
Keyword(s):  
Earth Rotation ◽  
Reference Systems ◽  
International Earth Rotation ◽  
Working Groups ◽  
General Relativistic ◽  
Definition Of

AbstractIn the last years, a fully general relativistic definition of reference systems and of their application to astronomy and geodesy has been passed into Resolutions of the scientific unions, following work of several working groups and of the community at large. In this community, the role of the International Earth Rotation and Reference systems Service (IERS) is to generate the terrestrial and celestial reference systems and the transformation between them, and the IERS Conventions provide the set of models and procedures used in the generation of IERS products. It is therefore essential that the IAU framework for relativity is introduced in the IERS Conventions, and that this is done consistently and completely throughout the document. The paper reviews relativistic aspects in the IERS Conventions and presents recent and on-going work aiming at providing a complete and consistent presentation for a new reference edition of the IERS Conventions, expected to appear in the next year.

scholarly journals IERS Standards

1992 ◽  
Vol 9 ◽  
pp. 161-162 ◽  
Author(s):  
D. McCarthy
Keyword(s):  
Earth Rotation ◽  
Polar Motion ◽  
Universal Time ◽  
Reference Systems ◽  
International Earth Rotation Service ◽  
Previous Version ◽  
International Earth Rotation ◽  
The Status ◽  
In The Beginning

Due to weather-related travel delays Dr. McCarthy was unable to present his scheduled paper. In his absence, however, Dr. K. Yokoyama, Chairman of the International Earth Rotation Service (IERS), reported on the status of the revision of the IERS Standards carried out by McCarthy who provided the following precis.These standards are meant to be used in the reduction of observations contributed to the IERS and by those who require IERS estimates of polar motion, Universal Time and nutation to establish the most precise celestial and terrestrial reference systems. The goal of the IERS is to publish the document, an update of the previous version (McCarthy, 1989), in the beginning of 1992.

scholarly journals Trends and variations in the irregularities of the Earth’s rotation

2021 ◽  
Vol 8 (1) ◽  
pp. 167-178
Author(s):  
Viktor M. Tissen ◽  
◽  
Zinoviy M. Malkin ◽  
◽  
◽  
...  
Keyword(s):  
Earth Rotation ◽  
Universal Time ◽  
Earth’S Rotation ◽  
Reference Systems ◽  
Earth's Rotation ◽  
International Earth Rotation ◽  
Harmonic Components

The paper presents results of modeling various variations of the Universal Time (UT1). To develop a variation models, UT1 observations from 1901 to 2020 published by the International Earth Rotation and Reference Systems Service (IERS) were used. Using the developed method, the main variations are identified from the diverse spectrum of irregularities in the Earth’s rotation, the models of which are presented as a superposition of a limited number of harmonic components. The results obtained in this paper are important for improving the accuracy of predictions of Universal Time.

scholarly journals Observing UT1-UTC with VGOS

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Rüdiger Haas ◽  
Eskil Varenius ◽  
Saho Matsumoto ◽  
Matthias Schartner
Keyword(s):  
Standard Deviation ◽  
Reference Frame ◽  
Earth Rotation ◽  
Space Observatory ◽  
International Earth Rotation ◽  
Onsala Space Observatory ◽  
X Band ◽  
First Results

AbstractWe present first results for the determination of UT1-UTC using the VLBI Global Observing System (VGOS). During December 2019 through February 2020, a series of 1 h long observing sessions were performed using the VGOS stations at Ishioka in Japan and the Onsala twin telescopes in Sweden. These VGOS-B sessions were observed simultaneously to standard legacy S/X-band Intensive sessions. The VGOS-B data were correlated, post-correlation processed, and analysed at the Onsala Space Observatory. The derived UT1-UTC results were compared to corresponding results from standard legacy S/X-band Intensive sessions (INT1/INT2), as well as to the final values of the International Earth Rotation and Reference Frame Service (IERS), provided in IERS Bulletin B. The VGOS-B series achieves 3–4 times lower formal uncertainties for the UT1-UTC results than standard legacy S/X-band INT series. The RMS agreement w.r.t. to IERS Bulletin B is slightly better for the VGOS-B results than for the simultaneously observed legacy S/X-band INT1 results, and the VGOS-B results have a small bias only with the smallest remaining standard deviation.

scholarly journals Relativistic aspects of rotational motion of celestial bodies

2009 ◽  
Vol 5 (S261) ◽  
pp. 112-123 ◽  
Author(s):  
S. A. Klioner ◽  
E. Gerlach ◽  
M. H. Soffel
Keyword(s):  
High Precision ◽  
Rotational Motion ◽  
Earth Rotation ◽  
Theoretical Framework ◽  
Reference Systems ◽  
The Moon ◽  
Newtonian Theory ◽  
Recent Developments ◽  
Celestial Bodies ◽  
Near Future

AbstractRelativistic modelling of rotational motion of extended bodies represents one of the most complicated problems of Applied Relativity. The relativistic reference systems of IAU (2000) give a suitable theoretical framework for such a modelling. Recent developments in the post-Newtonian theory of Earth rotation in the limit of rigidly rotating multipoles are reported below. All components of the theory are summarized and the results are demonstrated. The experience with the relativistic Earth rotation theory can be directly applied to model the rotational motion of other celestial bodies. The high-precision theories of rotation of the Moon, Mars and Mercury can be expected to be of interest in the near future.

scholarly journals The Celestial System and Frame of IERS

1991 ◽  
Vol 127 ◽  
pp. 198-201 ◽  
Author(s):  
E.F. Arias ◽  
M. Feissel
Keyword(s):  
Dynamical Systems ◽  
Physical Properties ◽  
Internal Consistency ◽  
Earth Rotation ◽  
International Earth Rotation Service ◽  
International Earth Rotation

AbstractThe celestial system maintained by the International Earth Rotation Service is described in terms of physical properties of the fiducial objects, internal consistency of the frame, and agreement with the FK5 and dynamical systems.

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