Results 31 to 40 of about 61,418 (298)
Effects of the Earth’ s triaxiality on the polar motion excitations
Geodesy and Geodynamics, 2012 his study aims to evaluate the significance of the Earth’s triaxiality to the polar motion theory. First of all, we compare the polar motion theories for both the triaxial and rotationally-symmetric Earth models, which is established on the basis of the ...
Chen Wei, Shen Wenbin
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On the external forcing of global eruptive activity in the past 300 years
Frontiers in Earth Science, 2023 The decryption of the temporal sequence of volcanic eruptions is a key step in better anticipating future events. Volcanic activity results from a complex interaction between internal and external processes, with time scales spanning multiple orders of ...
J-L. Le Mouël +16 more
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Characteristics of Perturbations in Recent Length of Day and Polar Motion [PDF]
Journal of Astronomy and Space Sciences, 2013 Various features of the existing perturbations in the Earth’s spin rotation are investigated for the recent and most reliable data by spectral analysis, filtering, and comparison with idealized model. First, theory of Earth’s spin rotational perturbation
Sung-Ho Na +4 more
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Polar Motion — An Overview [PDF]
International Astronomical Union Colloquium, 2000 AbstractAfter one hundred years of intensive study, some aspects of polar motion remain poorly understood. This motion of the Earth’s axis of rotation with respect to its mantle and crust has been observed and studied since the creation of the International Latitude Service.
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Image Motion of Remote Sensing Camera With Wide Field of View Over the Antarctic and Arctic
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2021 Imaging by the remote sensing camera with a wide field of view (WFV) is of great significance in the issue of polar environment. However, the instability of the image motion velocity poses a huge challenge to the observation task since the direction of ...
Jinliang Han +6 more
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Collective Motion of Vibrated Polar Disks [PDF]
Physical Review Letters, 2010 4 pages, 4 ...
Deseigne, Julien +2 more
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Astronomy & AstrophysicsContext. Five Venus missions are under development to study the planet in the next decade, with both NASA’s VERITAS and ESA’s EnVision featuring a geophysical investigation among their objectives. Their radar and gravity experiments will determine Venus’s orientation, enabling analyses of its spin dynamics to infer relevant geophysical and atmospheric ...
P.-L. Phan, N. Rambaux
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Temporal and spatial change in the relationship between sea-ice motion and wind in the Arctic
, 2020 This paper examines the temporal and spatial change in the characteristics of sea-ice motion in the Arctic. Ice motion is generally expressed by a motion at a constant ratio (wind factor) of wind speed, with a certain angle (turning angle) from the wind ...
Yamaguchi, Hajime +2 more
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Journal of Astronomy and Space SciencesTwo main components of polar motion are Chandler wobble and annual wobble. Annual wobble is obviously caused by the seasonal perturbations on the Earth – such was suspected as well as readily confirmed in unison.
Sung-Ho Na, Yu Yi
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Irregularities of the Polar Motion [PDF]
Symposium - International Astronomical Union, 1979 The independent series of coordinates of the pole obtained by the Defense Mapping Agency by observations of Transit satellites (DOP) and by the BIH using classical astrometry only (AST) are considered. They mainly differ by a periodic annual term. After removal of the mean annual difference from AST, the two series are compared.
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