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地球物理学报 2005
Nutation sequence of the rigid Earth determined by expansion of precise tidal generating potential
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Abstract:
With the improvement to theory of Melchior P. concerning tide and nutation, we obtain the precession and nutation moment induced by high_order tidal generating potential, and an associated dynamical equation of wobble and nutation for the rigid Earth. Then, we theoretically define CIP of Earth rigorously. Under the effect of every order tidal moment, the expression of precession and nutation for the CIP axis is presented. Theoretical deduction shows that precession and nutation moment induced by odd number order's tidal generating potential cause out_of_phase of longitude and obliquity nutation(namely, there is cos term in longitude nutation, and sin term in obliquity nutation). Finally, using expansion of precise tidal gengrating potential, we establish a new rigid Earth nutation sequence which consists of 737 terms in all. The new nutation sequence is a better complement to the nutation sequence REN2000(it contains 678 solar_lunar nutation terms)of the rigid Earth adopted by IERS2003