Results 21 to 30 of about 11,470 (155)
Excitation of Mars polar motion [PDF]
Astronomy & Astrophysics, 2006 In this paper, computations of Mars' polar motion are presented for Mars models with three homogeneous layers as a function of the radius of the inner core and for different excitation possibilities (atmosphere, ice caps, quakes). We estimated the amplitude of the two polar motion normal modes, i.e.
Dehant, Véronique +3 more
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Seismic excitation of the polar motion, 1977–1993 [PDF]
pure and applied geophysics, 1996 The mass redistribution in the earth as a result of an earthquake faulting changes the earth’s inertia tensor, and hence its rotation. Using the complete formulae developed by CHao and GRoss (1987) based on the normal mode theory, we calculated the earthquake-induced polar motion excitation for the largest 11,015 earthquakes that occurred during 1977.0–
Benjamin Fong Chao +2 more
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Assimilation of Earth rotation parameters into a global ocean model: excitation of polar motion [PDF]
Nonlinear Processes in Geophysics, 2011 The oceanic contribution to Earth rotation anomalies can be manifold. Possible causes are a change of total ocean mass, changes in current speed or location and changes in mass distribution.
J. Saynisch, M. Wenzel, J. Schröter
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Excitation of Polar Motion [PDF]
International Astronomical Union Colloquium, 2000 AbstractConceptual models of polar motion have evolved over the past century, as improved data revealed signals over progressively wider frequency bands. In the 1890s, Chandler represented polar motion as a sum of discrete components, 14 month and annual terms, and this component model effectively summarized the observations, but did not provide a ...
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The atmospheric excitation of rapid polar motions [PDF]
Symposium - International Astronomical Union, 1988 Analysis of data from new, highly accurate, geodetic techniques reveals rapid polar motions. Comparison of the new geodetic data and meteorological excitation estimates shows that the observed rapid polar motions are correlated with atmospheric pressure changes, and that these changes are related to atmospheric normal modes.
T. M. Eubanks +2 more
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Research on Earth rotation and geodynamics in Poland in 2015–2018 [PDF]
Geodesy and Cartography, 2019 This paper summarizes the activity of the chosen Polish geodetic research teams in 2015–2018 in the fields of Earth: rotation, dynamics as well as magnetic field.
Janusz Bogusz +2 more
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Earth, Planets and Space, 2021 In geodesy, a key application of data from the Gravity Recovery and Climate Experiment (GRACE), GRACE Follow-On (GRACE-FO), and Satellite Laser Ranging (SLR) is an interpretation of changes in polar motion excitation due to variations in the Earth’s ...
Justyna Śliwińska +2 more
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Coseismic Excitation of the Earth’s Polar Motion [PDF]
International Astronomical Union Colloquium, 2000 AbstractApart from the “shaking” near the epicenter that is the earthquake, a seismic event creates a permanent field of dislocation in the entire Earth. This redistribution of mass changes (slightly) the Earth’s inertia tensor; and the Earth’s rotation will change in accordance with the conservation of angular momentum.
B.F. Chao, R.S. Gross
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Atmospheric Excitation of Polar Motion [PDF]
International Astronomical Union Colloquium, 2000 AbstractVariations in the angular momentum of the atmosphere in the equatorial plane due to shifts in air mass distribution and changing winds impact the orientation of Earth so that motions of the pole occur on a broad range of time scales. The wind terms have notable diurnal fluctuations, which appear as a tidal signature. Subseasonal fluctuations of
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Comment [on “Polar motions excited by a convecting viscous mantle”] [PDF]
Geophysical Research Letters, 1993 Abstract In the last few years there has been a renewed interest in the problem of true polar wander (TPW) induced by slowly varying mass redistribution. Moser et al.,(1992) disagrees with our own results, Ricard et. al.(1992) on three different points:(1) The amplitude of the non-diagonal inertia perturbations that should be considered;(2) The ...
Y. Ricard, R. Sabadini, SPADA, GIORGIO
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