Results 41 to 50 of about 84,388 (175)
Research on Polar Motion Prediction Accuracy Based on ETH and GFZ Angular Momentum Forecast Products
Earth and Space Science, Volume 13, Issue 5, May 2026.Abstract Polar motion (PM), a critical element of Earth Orientation Parameters (EOP), is essential for high‐precision applications such as deep space exploration and satellite navigation. Recent advances in prediction methods utilizing Effective Angular Momentum (EAM) data have become a key pathway for enhancing PM forecast accuracy.
Xishun Li +10 more
wiley +1 more source
the excitation of the Chandler wobble [PDF]
Geophysical Research Letters, 2000 The Chandler wobble is an excited resonance of the Earth's rotation having a period of about 14 months. Although it has been under investigation for more than a century, its excitation mechanism has remained elusive. Here, the angular momentum of the atmosphere computed from the products of a numerical weather prediction analysis system and the angular
openaire +1 more source
Numerical solutions of rotational normal modes of a triaxial two-layered anelastic Earth
Geodesy and Geodynamics, 2019 The Earth's rotational normal modes depend on Earth model used, including the layer structures, principal inertia moments of different layers and the compliances.
Wenbin Shen +3 more
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Geomagnetic Secular Variation and Field Oscillations of External Origin at Huancayo, Peru
Brazilian Journal of Geophysics, 1996 The long uninterrupted series of magnetic measurements made at Huancayo close to the dip equator are analysed to bring out salient features of secular variation and oscillations of external origin in the magnetic elements. It is shown that the
G. K. Rangarajan, O. Veliz, B. R. Arora
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ENSO Modulates the Oceanic Excitation of Polar Motion
Geophysical Research Letters, Volume 52, Issue 18, 28 September 2025.Abstract The El Niño–Southern Oscillation (ENSO) exerts a strong control on interannual length‐of‐day variations, but its imprint on polar motion excitation remains to be identified. We explore the hypothesis that part of this imprint is embedded in oceanic angular momentum (OAM) changes, particularly that component driven by ocean bottom pressure pb $\
L. Börger +3 more
wiley +1 more source
Period and Qw of The Chandler Wobble [PDF]
Geophysical Journal International, 1974 A splined ILS/IPMS data set (1900–1973) from the most homogeneous values available has been analysed by the maximum entropy method of Burg. Principal conclusions are: (1) the spectral character of the Chandler wobble is a single broad peak, (2) the period is 432·95 ± 1·02 mean solar days and, (3) the Qw is 36±10.
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Earth, Planets and SpaceThe clear ~ 6-year beat in the polar motion data has allowed us to consider the Chandler period (P) as ~ 1.2 years, albeit approximately, from solely the observed polar motion data.
Ryuji Yamaguchi, Masato Furuya
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Research on Polar Motion Prediction Based on Radial Basis Function Neural Network Interpolation
Earth and Space Science, Volume 12, Issue 9, September 2025.Abstract Accurate prediction of polar motion are crucial for various scientific fields, including astronomy, geoscience, and oceanography. The temporal resolution of the modeling data currently utilized in polar motion prediction research is 1 day. This paper proposes to use multiple interpolation methods to interpolate the polar motion observation ...
Fei Wu +3 more
wiley +1 more source
Fine Detection of Transient Signals in GNSS Time Series Using Multi‐Station Hankel Spectrum Analysis
Journal of Geophysical Research: Solid Earth, Volume 130, Issue 6, June 2025.Abstract Fine detection of micro‐transient deformations exhibiting diverse spatiotemporal patterns is crucial for unraveling geophysical processes in geodetic data sets, despite the challenges posed by high noise levels and correlated periodic signals.
Kunpeng Shi +5 more
wiley +1 more source
Wavelet analysis of geomagnetic jerks [PDF]
, 2013 Geomagnetic jerks, or secular variation impulses, are abrupt changes in the slope of the first time derivative of the Earth's magnetic field. These changes occur on time scales of the order of a year. It has been demonstrated that the jerks might be more
de Wit, Tjaart Cornelis
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