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The eigenperiods of the translational oscillation modes of the Earth’s solid inner core, also referred to as the Slichter modes or Slichter triplet, are the key parameters that constrain the density jump across the inner core boundary (ICB). Definite observations of the Slichter triplet are still open. Here, we discuss and investigate this problem using the current most extensive superconducting gravimeter...
The search for the elusive Slichter triplet requires elaborate analysis of the elastic-gravitational mode characters and the non-stationary behavior of noisy time-series. A typical question is that it is difficult to characterize the excitations with attenuation by diffusion when their intensity is low compared to noise. Thus the theory for deriving the modes' frequencies is still controversial, and...
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