A Spectral Element Method to Compute Earth's Free Core Nutation

被引：1
|
作者：
Zhang, Mian [1 ,2 ]
Huang, Cheng-Li [1 ,2 ]
机构：
[1] Chinese Acad Sci, CAS Key Lab Planetary Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
[2] Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
来源：
RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2023年 / 23卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Earth; planets and satellites: interiors; methods: numerical; ELASTIC-GRAVITATIONAL EXCITATION; FORCED NUTATIONS; SCALAR EQUATIONS; MODES; REPRESENTATION; OSCILLATION; DYNAMICS; MOTION; PERIOD;
D O I：
10.1088/1674-4527/ace51c
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Free Core Nutation (FCN) is a rotational mode caused by non-alignment of the rotation axis of the core and of the mantle. Its period observed by VLBI and superconducting gravimetry is around 430 sidereal days (Sd) with precision of better than 1 Sd, while its "theoretical" period calculated by traditional approaches and a given Earth model ranges from 450 to 470 Sd. Their gap of about 30 Sd is significant compared with its observation precision. We propose a spectral element method to compute the period of FCN and obtain a period of 434 Sd which is very close to the observed value.
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页数：9
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