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题名: Estimation of the free core nutation period by the sliding-window complex least-squares fit method
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
DOI: 10.1016/j.asr.2016.03.028
文章类型: Article
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
项目资助者: NSFC Grant(11373057 ; STCSM Grant(06DZ22101) ; US NSFC Grant(ATM-0913780) ; CAS Visiting Professorship for Senior International Scientists ; 11303073 ; 11133004)
语种: 英语
WOS记录号: WOS:000375810100005
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16211
Appears in Collections:暗物质和空间天文实验室_期刊论文

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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
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