Results 31 to 40 of about 380,733 (291)

Geodetic residual time series: A combined series by minimization of their internal noise level

Frontiers in Earth Science, 2023
This study aims to assess the hydrological effects of polar motion calculated from different combinations of geophysical excitations at decadal, seasonal, and non-seasonal periods.
Małgorzata Wińska
doaj   +1 more source

Main Oscillatory Polar Motion of the Earth and Its Excitation: Investigation in Both the Frequency and Time Domains

Journal of Astronomy and Space Sciences
Two 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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Discrete polar motion equations [PDF]

Geophysical Journal International, 1985
Summary. A digital filter equation is derived which is appropriate for pfedicting polar motion from excitation axis displacements, or for inferring the excitation axis changes from observed polar motion. The result differs from previously published equations in its phase response.
openaire   +1 more source

Pulsar Magnetospheric Emission Mapping: Images and Implications of Polar-Cap Weather [PDF]

, 1999
The beautiful sequences of ``drifting'' subpulses observed in some radio pulsars have been regarded as among the most salient and potentially instructive characteristics of their emission, not least because they have appeared to represent a system of ...
Arons J., Avinash A. Deshpande, de Jager O. C., Joanna M. Rankin, Jones P. B., Mitra D., Radhakrishnan V., Sieber W., Sieber W., Suleymanova S. A., Suleymanova S. A., Taylor J. H., Usov V. V., Zhang B.   +13 more
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Emergence of macroscopic directed motion in populations of motile colloids

, 2013
From the formation of animal flocks to the emergence of coordinate motion in bacterial swarms, at all scales populations of motile organisms display coherent collective motion.
Bartolo, Denis, Bricard, Antoine, Caussin, Jean-Baptiste, Dauchot, Olivier, Desreumaux, Nicolas   +4 more
core   +3 more sources

Spark Model for Pulsar Radiation Modulation Patterns [PDF]

, 2000
A non-stationary polar gap model first proposed by Ruderman & Sutherland (1975) is modified and applied to spark-associated pulsar emission at radio wave-lengths.
Blanford R. D., Gil J., Gil J., Gil J., Gil J., J. A. Gil, Kijak J., Kramer M., Kramer M., Lyne A. G., M. Sendyk, Mitra D., Radhakrishnan V., Rankin J. M., Sieber W., Zhang B.   +15 more
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Prediction of polar motion and UT1-UTC based on the hybrid EEMD_LSTM model

Geo-spatial Information Science
Accurate and real-time Earth rotation parameters (ERPs) are crucial for various scientific fields, including astronomy, geoscience, and oceanography.
Chenxiang Wang, Pengfei Zhang, Wenbin Shen, Jiayao Wang   +3 more
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Integrating Motion Compensation With Polar Format Interpolation for Enhanced Highly Squinted Airborne SAR Imagery

IEEE Access, 2019
Spatial-variant motion compensation (MOCO) is critical for high resolution and highly squinted airborne synthetic aperture radar (SAR) imaging. Conventional imaging strategies generally perform systematic imaging algorithm and motion compensation ...
Fengfei Wang, Lei Zhang, Yunhe Cao, Guanyong Wang   +3 more
doaj   +1 more source

Estimating Sensor Motion from Wide-Field Optical Flow on a Log-Dipolar Sensor [PDF]

, 2004
Log-polar image architectures, motivated by the structure of the human visual field, have long been investigated in computer vision for use in estimating motion parameters from an optical flow vector field. Practical problems with this approach have been:
Polimeni, Jonathan, Schwartz, Eric, Wagner, Robert   +2 more
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A New Parameterization of Polar Motion [PDF]

International Astronomical Union Colloquium, 1980
AbstractThe rotational motion of the earth is decomposed into spin, polar motion and local motions. The rotation vector components are associated to phenomena such as precession, nutation, diurnal spin, polar motion and local motions. The above decomposition is accomplished without refering to an earth-fixed CIO pole or BIH zero meridian. The time-like
openaire   +1 more source