Fig. 2: Normalized AR-z spectra of the used polar motion (PM) and length-of-day variations (ΔLOD) records (1949–2020).
From: Inner core static tilt inferred from intradecadal oscillation in the Earth’s rotation
The AR-z spectra of the PM (a) and ΔLOD (b) records in which the atmospheric and oceanic angular momentum effects were removed. Different colored rectangles indicate different periodic signals; the gray area represents 95% confidence intervals (C.I.).
