Revisit to the fluid Love numbers and the permanent tide of the Earth

IF 0.8 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY Journal of the Korean Physical Society Pub Date : 2024-10-03 DOI:10.1007/s40042-024-01174-9
Sung-Ho Na, Yu Yi, Young-Hong Shin
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Abstract

Love numbers h, k, and l are convenient parameters to assess the deformation of the Earth or other planet due to external perturbing forces. While the elastic Love numbers are used for tidal deformation, the correct amount of permanent tidal deformation can be assessed using the fluid Love numbers. Accurate values of the elastic Love numbers of Earth have been repeatedly attained for several Earth models, and also the fluid Love numbers hf and kf of the Earth were recently reported. In this short note, new evaluation of the Earth’s fluid Love number as well as secular Love number, both originally defined by Munk and MacDonald, is presented using updated values of the Earth’s physical property model and with minute enhancement in the formulation; \({(h}_{s}, {k}_{s}) =(1.9437, 0.9437)\) by their 1st approach and \({(h}_{f}, {k}_{f}) =(1.9337, 0.9337)\) by their 2nd approach. Through numerical calculations with gradual stepwise reduction in rigidity, the three fluid Love numbers of the Earth were determined as: (hf, kf, lf) = (1.935, 0.935, 1.07) for PREM and (hf, kf, lf) = (1.937, 0.937, 1.07) for ak135-F Earth models. In addition, the fluid Love numbers of other spherical harmonic degrees 0, 3, 4, and 5 were estimated. The permanent tide of the Earth ellipsoid due to the Moon and the Sun has been re-calculated: the vertical displacement of the permanent tide is 0.1924 m at the equator and \(- 0.3801\) m at the pole, while the horizontal displacement of the permanent tide is found to be 0.317 m at mid-latitude.

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重温流动的爱的数字和地球永久的潮汐
爱数 h、k 和 l 是评估地球或其他行星在外部扰动力作用下发生形变的便捷参数。弹性爱数用于潮汐形变,而永久潮汐形变的正确量则可以用流体爱数来评估。在几个地球模型中,地球弹性爱数的精确值已被反复求得,最近还报告了地球流体爱数 hf 和 kf。在这篇短文中,使用地球物理性质模型的更新值和微小的改进公式,对最初由 Munk 和 MacDonald 定义的地球流体爱数和世俗爱数进行了新的评估;\({(h}_{s}, {k}_{s}) =(1.9437,0.9437);第二种方法是 \({(h}_{f}, {k}_{f})=(1.9337,0.9337)\)。通过逐步降低刚度的数值计算,确定了地球的三个流体洛夫数:(hf, kf, lf) = (1.935, 0.935, 1.07);ak135-F 地球模型的 (hf, kf, lf) = (1.937, 0.937, 1.07)。此外,还估算了其他球谐波度 0、3、4 和 5 的流体爱数。重新计算了月球和太阳引起的地球椭球体永久潮汐:永久潮汐的垂直位移在赤道为 0.1924 米,在极点为(- 0.3801)米,而永久潮汐的水平位移在中纬度为 0.317 米。
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来源期刊
Journal of the Korean Physical Society
Journal of the Korean Physical Society PHYSICS, MULTIDISCIPLINARY-
CiteScore
1.20
自引率
16.70%
发文量
276
审稿时长
5.5 months
期刊介绍: The Journal of the Korean Physical Society (JKPS) covers all fields of physics spanning from statistical physics and condensed matter physics to particle physics. The manuscript to be published in JKPS is required to hold the originality, significance, and recent completeness. The journal is composed of Full paper, Letters, and Brief sections. In addition, featured articles with outstanding results are selected by the Editorial board and introduced in the online version. For emphasis on aspect of international journal, several world-distinguished researchers join the Editorial board. High quality of papers may be express-published when it is recommended or requested.
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