On the Mantle-Inner Core Gravitational Oscillation Under the Action of the Electromagnetic Coupling Effects
文献类型：期刊论文
| 作者 | Duan, Pengshuo2; Huang, Chengli1,2 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2020-02-01 |
| 卷号 | 125期号:2页码:19 |
| ISSN号 | 2169-9313 |
| DOI | 10.1029/2019JB018863 |
| 英文摘要 | Previous works indicated that the eigenperiod of the mantle-inner core gravitational coupling mode can match the observed 6-year period in length-of-day. However, this mode is only an ideal model, since it does not involve the electromagnetic (EM) coupling effects. Here, we further study the mantle-inner core gravitational mode and its mathematical equation under the action of the EM coupling effects, while the relevant damping oscillation analytical solution is also given. According to this theoretical model, we can constrain the core-mantle gravitational coupling strength Gamma (>6.5 x 10(19) Nm) and infer the EM coupling information at the core-mantle boundary (CMB) and the inner core boundary. This work indicates that a partial liquid core is necessarily required to be coupled to the inner core (IC) and axially rotates with the IC as a single body, which supports the recent assumption that only a part fluid core within the so-called tangent cylinder is locked to the IC. This explanation can greatly weaken the perturbation magnetic field due to the shear oscillation at the inner core boundary and eliminate the relevant EM damping dissipation, otherwise, the predicted 6-year oscillation will be rapidly decayed with a relaxation time similar to 9.8 days. In addition, we give the physical expression of the theoretical quality factor Q value of the 6-year oscillation, which is mainly related to the EM coupling at the CMB. According to the typical EM coupling parameters at the CMB, the theoretical Q value is predicted in the range of 40-75, which coincides with the current observed result (similar to 51.6). |
| WOS关键词 | TORSIONAL OSCILLATIONS ; EARTHS CORE ; LENGTH ; ROTATION ; WAVES ; EXCITATION ; DYNAMICS ; CONSTRAINTS ; CONVECTION ; GEOPHYSICS |
| 资助项目 | National Natural Science Foundation of China[11803064] ; National Natural Science Foundation of China[41774017] ; National Natural Science Foundation of China[11773058] ; China Postdoctoral Science Foundation[2017 M621561] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000530895200055 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/54909]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Duan, Pengshuo; Huang, Chengli |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, CAS Key Lab Planetary Sci, Shanghai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Duan, Pengshuo,Huang, Chengli. On the Mantle-Inner Core Gravitational Oscillation Under the Action of the Electromagnetic Coupling Effects[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2020,125(2):19. |
| APA | Duan, Pengshuo,&Huang, Chengli.(2020).On the Mantle-Inner Core Gravitational Oscillation Under the Action of the Electromagnetic Coupling Effects.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,125(2),19. |
| MLA | Duan, Pengshuo,et al."On the Mantle-Inner Core Gravitational Oscillation Under the Action of the Electromagnetic Coupling Effects".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 125.2(2020):19. |
入库方式： OAI收割
来源：国家天文台
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