Results 11 to 20 of about 2,970,939 (235)

Research on Polar Motion Prediction Based on Radial Basis Function Neural Network Interpolation

Earth and Space Science
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.
Fei Wu, Zefeng Yan, Leyang Wang, Xinbo Li   +3 more
doaj   +2 more sources

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
doaj   +2 more sources

Improving the Accuracy of Polar Motion Prediction by Combining Least Squares and the iTransformer Model

Earth and Space Science
Polar motion prediction is an important means to study the dynamics of Earth's rotation and detect the internal structure of the Earth. This paper proposes an LS + iTransformer method that combines the least squares (LS) method with the iTransformer deep
Huizhong Zhu, Yi Yang, Chunhua Jiang, Wenfeng Nie, Zhenyu Luo, Zhangzhen Sun   +5 more
doaj   +2 more sources

Segmented Polar Motion Prediction Based on Varying Effective Angular Momentum Forecast Horizons

Universe
Polar motion (PM), a key component of Earth orientation parameters (EOPs), is essential for high-precision satellite orbit determination and deep-space navigation.
Yangyang Cui, Xishun Li, Yuanwei Wu, Haihua Qiao, Dang Yao, Zewen Zhang, Zhizhuo Zhang, Xuhai Yang   +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, Hubert, B., Milan, S. E., B. Hubert (7590023), Steve E. Milan (7589666), Grocott, A., Adrian Grocott (7590026)   +6 more
core   +5 more sources

Precise prediction of polar motion using sliding multilayer perceptron method combining singular spectrum analysis and autoregressive moving average model

Earth, Planets and Space, 2023
The precise prediction of polar motion parameters is needed for the astrogeodynamics, navigation and positioning of the deep space probe. However, the current prediction methods are limited to predicting polar motion for specific periods, either short ...
Kezhi Wu, Xin Liu, Xin Jin, Xiaotao Chang, Heping Sun, Jinyun Guo   +5 more
doaj   +1 more source

Improved Prediction of Polar Motions by Piecewise Parameterization

Artificial Satellites, 2022
Abstract On seanonal timescale, the variation of Earth rotation is mainly regulated by angular momentum exchanges between the solid Earth and the fluidal atmosphere, ocean and hydrosphere. In the 2nd EOP PCC, we developed Dill2019’s method for polar motion prediction, using piecewise autoagressive parameters.
Yuanwei Wu, Xin Zhao, Xinyu Yang
openaire   +1 more source

Improving the accuracy of polar motion prediction using a hybrid least squares and long short-term memory model

Earth, Planets and Space, 2023
Earth rotation parameters (ERPs) are essential for transforming between the celestial and terrestrial reference frames, and for high-precision space navigation and positioning.
Chenxiang Wang, Pengfei Zhang
doaj   +1 more source

Predictability of the Earth’s polar motion [PDF]

Bulletin Géodésique, 1985
A comprehensive, experimental study of the predictability of the polar motion using a homogeneous BIH (Bureau International de l'Heure) data set is presented. Based on knowledge of the physics of the annual and the Chandler wobbles, the numerical model for the polar motion is constructed by allowing the wobble periods to vary.
openaire   +1 more source

Polar Research turns 40

, 2022
Among his varied Resistance activities during the Nazi occupation of Norway, Tore Gjelsvik co-edited an underground newspaper called Bulletinen (The Bulletin).
Helle V. Goldman, Goldman, Helle V.
core   +1 more source