The effect of the differential rotation of the earth inner core on the free core nutation
作者：Mian Zhang,Chengli Huang
摘要：Seismic observations shows that the inner core rotates faster than the mantle and the rotation axis of the inner core may not align with the rotation axis of the mantle. Free core nutation reflects core’s information. We discuss the effect of the inner core’s differential rotation on free core nutation from two aspects: rotation speed and deflection angle. Our result shows it is in accordance with the observations when the inner core’s rotation speed doesn’t exceed 10° faster than mantle’s per year, and the deflection angle is less than 1°,if the rotation speed and the deflection angle are respectively considered separately.
发文机构：Key Laboratory of Planetary Sciences School of Astronomy and Space Sciences
关键词：INNERCOREDIFFERENTIALROTATIONFreeCORENUTATION
分类号： P137.2[天文地球—天体力学][天文地球—天文学]
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