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- 2016
利用全球分布超导重力台站探测Slichter模分裂信号
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Abstract:
观测地球内核平动振荡Slichter模有助于约束地球内部结构，但其探测仍是国际性难题。基于全球分布的9个超导重力（Superconductiug Gravimeter, SG）台站的11个观测序列，利用最优序列估计（optimal sequence estimation, OSE） 方法进行了探测实验。首先利用模拟的11个SG台站记录验证了OSE方法的有效性，然后将OSE方法用于剔除潮汐及气压等影响后的实测重力残差数据，但所得结果中仍残留有高阶潮波信号。针对此，利用解调过程进一步剔除了这些信号，以消除对目标信号识别的影响。最终结果表明，没有发现Smylie于1992年发表论文中所声称的观测结果，但找到了另外一组满足分裂规律的可能信号，其周期分别为4.310±5.7×10-3 h（m=-1）、3.914±6.4×10-3 h（m=0）和3.642±5.1×10-3 h（m=+1）。该组信号很可能是Slichter模三重分裂信号，但仍需进一步验证
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