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《Chinese Journal of Geophysics》 2014-02
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Temporal variation of the period of free core nutation derived from VLBI and superconducting gravity data

CUI Xiao-Ming;SUN He-Ping;XU Jian-Qiao;ZHOU Jiang-Cun;ZHOU Hong-Wei;State Key Laboratory of Geodesy and Earth′s Dynamics,Institute of Geodesy and Geophysics,CAS;University of Chinese Academy of Sciences;Xiamen Research Center of Seismology Survey;  
This study is based on the observation that the resonance enhancement in the gravity tides and nutations is caused by Free Core Nuation(FCN).FCN parameters are determined by the least square method using 6 VLBI observation series from International VLBI service and superconducting gravity observations at 7Europe stations.The FCN periods obtained from VLBI observations are very stable with a variation less than 1sidereal day and show a decadal variation.The results obtained by stacking SG observations have relatively larger variations.Influence factors on the FCN period are analyzed according to its theoretical models.The results show that there exists possible correlation between the variable FCN period and magnetic coupling,and thechange of magnetic field at the core-mantle boundary is likely the cause for temporal variation of the period of FCN.
【Fund】: 国家重点基础研究发展计划(973)项目(2014CB845902);; 国家自然科学基金项目(41321063 41074053 41274085和41304058)联合资助
【CateGory Index】: P223
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