Estimation of the free core nutation period by the sliding-window complex least-squares fit method
文献类型：期刊论文
| 作者 | Zhou, Yonghong1,3; Zhu, Qiang1,4; Salstein, David A.2; Xu, Xueqing1,3; Shi, Si1,4; Liao, Xinhao1,3 |
| 刊名 | ADVANCES IN SPACE RESEARCH
 |
| 出版日期 | 2016-05-15 |
| 卷号 | 57期号:10页码:2136-2140 |
| 关键词 | Earth rotation variations Outer core Inner core Time-series analysis |
| 英文摘要 | Estimation of the free core nutation (FCN) period is a challenging prospect. Mostly, two methods, one direct and one indirect, have been applied in the past to address the problem by analyzing the Earth orientation parameters observed by the very long baseline interferometry. The indirect method estimates the FCN period from resonance effects of the FCN on forced nutation terms, whereas the direct method estimates the FCN period using the Fourier Transform (FT) approach. However, the FCN period estimated by the direct FT technique suffers from the non-stationary characteristics of celestial pole offsets (CPO). In this study, the FCN period is estimated by another direct method, i.e., the sliding-window complex least -squares fit method (SCLF). The estimated values of the FCN period for the full set of 1984.0-2014.0 and four subsets (1984.0-2000.0, 2000.0-2014.0, 1984.0-1990.0, 1990.0-2014.0) range from -428.8 to -434.3 mean solar days. From the FT to the SCLF method, the estimate uncertainty of the FCN period falls from several tens of days to several days. Thus, the SCLF method may serve as an independent direct way to estimate the FCN period, complementing and validating the indirect resonance method that has been frequently used before. (C) 2016 COSPAR. Published by Elsevier Ltd. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences |
| 研究领域[WOS] | Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences |
| 关键词[WOS] | ATMOSPHERIC EXCITATION ; FORCED NUTATIONS ; INNER-CORE ; VLBI ; PARAMETERS ; EARTH ; DYNAMICS ; MOTION ; MODELS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000375810100005 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/16211]  |
| 专题 | 紫金山天文台_暗物质和空间天文实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Atmospher & Environm Res, Lexington, MA 02421 USA 3.Chinese Acad Sci, Key Lab Planetary Sci, Shanghai 200030, Peoples R China 4.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, Yonghong,Zhu, Qiang,Salstein, David A.,et al. Estimation of the free core nutation period by the sliding-window complex least-squares fit method[J]. ADVANCES IN SPACE RESEARCH,2016,57(10):2136-2140. |
| APA | Zhou, Yonghong,Zhu, Qiang,Salstein, David A.,Xu, Xueqing,Shi, Si,&Liao, Xinhao.(2016).Estimation of the free core nutation period by the sliding-window complex least-squares fit method.ADVANCES IN SPACE RESEARCH,57(10),2136-2140. |
| MLA | Zhou, Yonghong,et al."Estimation of the free core nutation period by the sliding-window complex least-squares fit method".ADVANCES IN SPACE RESEARCH 57.10(2016):2136-2140. |
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来源：紫金山天文台
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