HIGH-DEGREE MODELS OF THE EARTH'S GRAVITATIONAL FIELD: HISTORY OF DEVELOPMENT, ASSESSMENT OF PROSPECTS AND RESOLUTION
1 Schmidt Institute of Physics of the Earth of RAS 2 Sirius University of Science and Technology
Journal: Science and technological developments
Keywords: Earth's gravitational field, gravitational field model, spherical harmonics, gravity anomalies, satellite gravimetry, altimetry
Аnnotation: The article provides a generalized retrospective of creating global models of the Earth’s gravitational field using satellite methods, modern global ultra-high-degree models and the most promising new solutions are considered. The main attention is given to the review of techniques that affect the resolution of satellite methods, their development and ways of further improvement. Modern combined models of the Earth's gravity field, which also include altimetry data, instrumental surveys and global topography, are most interesting. The areas of the possible practical application of global models and the applied problems solved with their help depend on an understanding of the nature of model data and methods for their modification. At present, the resolution of models up to 5540 degrees of field expansion in spherical harmonics is achievable; however, high values of their degree and order do not always determine the reliability of the presented model data (not verified by direct measurements). Therefore, along with the most high-degree solutions, this article considers most of the known models of the Earth's gravitational field and their most characteristic modifications.