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Secular Changes in the Moon's Mean Motion and Earth Rotation Rate Due to Tidal Dissipation

ZHU Yao zhong, WU Bin, PENG Bi bo (Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics,CAS, Wuhan 430077,China)  
Using 11 years (1983~1994) observation data of Satellite Laser Ranging (SLR) to the Lageos 1 satellite in the global tracking network,we estimate the second degree gravity field coefficient and tidal parameters. The tidal solutions obtained from SLR and satellite altimetry are used to compute the secular changes in the Moon's orbit elements and the Earth rotation rate in the ecliptic reference system. The SLR derived secular change in the Moon's mean motion caused by the total tidal dissipation is -24.78 arc sec/century 2,agreeing very well with the result ((-24.9±1.0) arc sec/century 2) from the analysis of the lunar laser ranging data. The secular change in the Earth rotation rate caused by the solar and lunar tides is -5.25×10 -22 rad/s 2. Taking into account the non tidal effect of the changes in the Earth rotation rate, the corresponding change in length of day is 1.49 ms/century. This value is consistent with recent astronomical result (1.4 ms/century) of eclipse records since 1620. We also combine the tidal solutions determined by altimetry and SLR to distinguish the dissipation effects of the solid Earth and oceans on the secular variations of the Moon's mean motion and Earth rotation rate.
【Fund】: 国家自然科学基金资助项目 !( 49774 2 2 9) ;; 国家攀登计划资助项目! ( 970 2 310 0 3)
【CateGory Index】: P223
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Chinese Journal Full-text Database 1 Hits
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