Chandler wobble period and Q derived by wavelet transform
文献类型：期刊论文
| 作者 | Liao, DC; Zhou, YH |
| 刊名 | CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2004-06-01 |
| 卷号 | 4期号:3页码:247-257 |
| 关键词 | polar motion Chandler wobble wavelet transform instantaneous period |
| 英文摘要 | We apply complex Morlet wavelet transform to three polar motion data series, and derive quasi-instantaneous periods of the Chandler and annual wobble by differencing the wavelet transform results versus the scale factor, and then find their zero points. The results show that the mean periods of the Chandler (annual) wobble are 430.71 +/- 1.07 (365.24 +/- 0.11) and 432.71 +/- 0.42 (365.23 +/- 0.18) mean solar days for the data sets of 1900-2001 and 1940-2001, respectively. The maximum relative variation of the quasi-instantaneous period to the mean of the Chandler wobble is less than 1.5% during 1900-2001 (3%-5% during 1920-1940), and that of the annual wobble is less than 1.6% during 1900-2001. Quasi-instantaneous and mean values of Q are also derived by using the energy density-period profile of the Chandler wobble. An asymptotic value of Q = 36.7 is obtained by fitting polynomial of exponential of sigma(-2) to the relationship between Q and sigma during 1940-2001. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | FREQUENCY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000222201200005 |
| 公开日期 | 2010-07-30 |
| 源URL | [http://119.78.226.72//handle/331011/10484]  |
| 专题 | 上海天文台_天文地球动力学研究中心 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liao, DC,Zhou, YH. Chandler wobble period and Q derived by wavelet transform[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2004,4(3):247-257. |
| APA | Liao, DC,&Zhou, YH.(2004).Chandler wobble period and Q derived by wavelet transform.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,4(3),247-257. |
| MLA | Liao, DC,et al."Chandler wobble period and Q derived by wavelet transform".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 4.3(2004):247-257. |
入库方式： OAI收割
来源：上海天文台
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