Results 11 to 20 of about 1,852,127 (286)
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.
V. Dehant +3 more
openaire +3 more sources
Analyses of zonal atmospheric excitation functions and their correlation with polar motion excitation functions [PDF]
Annales Geophysicae, 1997 The atmospheric influence on the Earth's, rotation can be described by the effective atmospheric angular momentum (EAAM) functions. In this study we focus on the analysis of short period variations of the equatorial components of the zonal EAAM ...
J. Nastula, W. Kosek, B. Kolaczek
doaj +3 more sources
Chaotic oceanic excitation of low-frequency polar motion variability [PDF]
Earth System DynamicsStudies of Earth rotation variations generally assume that changes in non-tidal oceanic angular momentum (OAM) manifest the ocean's direct response to atmospheric forces.
L. Börger +7 more
doaj +2 more sources
Formation and motion of a transpolar arc in response to dayside and nightside reconnection [PDF]
, 2005 peer reviewed[ 1] We trace the formation and subsequent motion of a transpolar arc in response to dayside and nightside reconnection. Both high- and low-latitude dayside reconnection are observed, as well as periods of substorm and nonsubstorm nightside ...
Hubert, Benoît +6 more
core +5 more sources
Remote Sensing, 2021 Similar to seasonal and intraseasonal variations in polar motion (PM), interannual variations are also largely caused by changes in the angular momentum of the Earth’s geophysical fluid layers composed of the atmosphere, the oceans, and in-land ...
Małgorzata Wińska
doaj +1 more source
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
doaj +1 more source
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
openaire +1 more source
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 ...
openaire +1 more source
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
doaj +1 more source
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
openaire +1 more source