Libration in the Earth's rotation
Geophysical Research Letters1991Vol. 18(11), pp. 2007–2010
Citations Over TimeTop 12% of 1991 papers
Abstract
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, that of the polar libration is 0.06 milliarcseconds. Implications concerning their detectability and role in the tidal variation of Earth rotation are discussed.
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