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Parameters of the fluid core resonance inferred from superconducting gravimeter data

机译：由超导重力仪数据推断出的流体核心共振参数

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摘要

We have estimated the parameters of fluid core resonance (FCR) due to the nearly diurnal free wobble of the Earth's core based on the superconducting gravimeter (SG) data obtained at the following four observation sites; Esashi and Matsushiro in Japan, Canberra in Australia and Membach in Belgium. By fitting the tidal admittances normalized with the O1 wave at each site to a model of the damped harmonic oscillator, we obtained values of 429.66 +-1.43 sidereal days, 9350-10,835, -4.828E-4+-3.4E-6, -3.0E-5+-4.5E-6 for the eigenperiod, the Q-value and the real and imaginary parts of the resonance strength, respectively. Our values obtained from only using the gravity data are very consistent with those inferred from the VLBI nutation data. Our study strongly indicates that the systematic difference between two estimations from the gravity and the nutation in particular for the Q-value, which has been shown in previous works, is mainly caused by the inaccurate correction for the ocean tide effects. The error in the ocean tide correction is discussed based on the comparison among four global ocean tide models; Schwiderski model (1980), NAO.99b (Matsumoto et al., 2000), CSR4.0 (Eanes and Bettadpur, 1994) and GOT99.2b (Ray, 1999).
机译：根据在以下四个观测点获得的超导重力仪（SG）数据，我们估算了由于地核的近日自由摆动而引起的流体核共振（FCR）参数；日本的Esashi和Matsushiro，澳大利亚的堪培拉和比利时的Membach。通过将每个位置的O1波标准化的潮汐导纳拟合到阻尼谐波振荡器的模型，我们获得了429.66 + -1.43恒星天，9350-10,835，-4.828E-4 + -3.4E-6，-共振强度的本征周期，Q值和实部和虚部分别为3.0E-5 + -4.5E-6。我们仅使用重力数据获得的值与从VLBI章法数据推断出的值非常一致。我们的研究有力地表明，先前的工作已经表明，根据重力和章动性（尤其是针对Q值）进行的两种估算之间的系统差异主要是由于对海潮影响的校正不正确造成的。在对四种全球海潮模型进行比较的基础上，讨论了海潮校正中的误差。 Schwiderski模型（1980），NAO.99b（Matsumoto等，2000），CSR4.0（Eanes和Bettadpur，1994）和GOT99.2b（Ray，1999）。

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