Results 31 to 40 of about 2,176,992 (296)
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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Contributions of core, mantle and climatological processes to Earth’s polar motion
Nature GeoscienceEarth’s spin axis slowly moves relative to the crust over time. A 120-year-long record of this polar motion from astronomical and more modern geodetic measurements displays interannual and multidecadal fluctuations of 20 to 40 milliarcseconds ...
M. Kiani Shahvandi +7 more
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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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Earth and Space ScienceGrowing interest in Earth Orientation Parameters (EOP) resulted in various approaches to the EOP prediction algorithms, as well as in the exploitation of distinct input data, including the observed EOP values from various operational data centers and ...
T. Kur +50 more
semanticscholar +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 ...
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Excitation of Mars polar motion [PDF]
, 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).
O. de Viron +7 more
core +1 more source
The motion of point vortices on closed surfaces [PDF]
, 2015 We develop a mathematical framework for the dynamics of a set of point vortices on a class of differentiable surfaces conformal to the unit sphere. When the sum of the vortex circulations is non-zero, a compensating uniform vorticity field is required to
Dritschel, David Gerard, Boatto, S
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EOS Microwave Limb Sounder Observations of the Antarctic Polar Vortex Breakup in 2004 [PDF]
, 2005 Observations from the Microwave Limb Sounder (MLS) on NASA's new Aura satellite give an unprecedentedly detailed picture of the spring Antarctic polar vortex breakup throughout the stratosphere.
Waters, J. W. +7 more
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Influence of winter sea-ice motion on summer ice cover in the Arctic [PDF]
, 2013 Summer sea-ice cover in the Arctic varies largely from year to year owing to several factors. This study examines one such factor, the relationship between interannual difference in winter ice motion and ice area in the following summer.
Nishimura, Akira +7 more
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A Bibliometric Analysis of Publications in Uremic Toxins From 1991 to 2024
Therapeutic Apheresis and Dialysis, EarlyView.ABSTRACT Background Uremic toxins are a growing area of research in nephrology, with significant implications in the progression and treatment of chronic kidney disease (CKD) and the management of end‐stage kidney disease (ESKD). This bibliometric analysis aims to evaluate the global research trends, key contributors, and the impact of publications in ...
Yuh‐Shan Ho +7 more
wiley +1 more source