LIBRATION IN THE EARTHS ROTATION

被引：35

作者：

CHAO, BF ^{[1
]}

DONG, DN ^{[1
]}

LIU, HS ^{[1
]}

HERRING, TA ^{[1
]}

机构：

[1] MIT,DEPT EARTH ATMOSPHERE & PLANETARY SCI,CAMBRIDGE,MA 02139

来源：

GEOPHYSICAL RESEARCH LETTERS | 1991年 / 18卷 / 11期

关键词：

D O I：

10.1029/91GL02491

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

External luni-solar torque exerted on the difference (B-A) of the Earth's two equatorial principal moments of inertia gives rise to two types of librational motions in the Earth's rotation: the semidiurnal libration in spin and the prograde diurnal libration in polar motion. Formulas for the librations considering a realistic Earth model and their tidal decompositions are derived and evaluated. The spin libration has a maximum peak-to-peak amplitude of 0.09 milliarcseconds. Implications concerning their detectability and role in the tidal variation of Earth rotation are discussed.

引用

页码：2007 / 2010

页数：4

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