On the Model of Equatorial Magnetic‐Archimedes‐Coriolis Waves Propagating at Earth's Core Surface and the Potential Implications

Abstract

showed that the Earth equatorial region is a place of presenting vigorously localized interannual alternating fluid motions, which reflects the short-period fluctuations in geomagnetic acceleration. For example, Gillet et al. (2015) found that the strongly interannual time-dependent azimuthal fluid outer core (FOC) flows occur at the equatorial region with latitude below 10°; Finlay et al. (2016) showed that the observed pulses in geomagnetic acceleration mainly locate below the India Ocean between the equator and 30 𝐴𝐴 • S from the CHAOS-6 model, while Kloss and Finlay ( 2019) presented a new model of time-dependent core flow derived from geomagnetic measurements by Swarm and CHAMP satellites and ground observatories, which further confirmed the equatorially confined phenomena (within latitudes ∼15 𝐴𝐴• N and S) of the non-zonal azimuthal core flows and geomagnetic

Dynamic Mode Decomposition of the Core Surface Flow Inverted From Geomagnetic Field Models

“…This suggests that SA pulses are resulted from the superposition of two dynamic modes. These modes may be signatures of Magnetic‐Coroilis waves (Gillet et al., 2022; Luo et al., 2022) or Magnetic‐Archimedes‐Coriolis waves (Buffett & Matsui, 2019; Duan et al., 2023), though the physical nature of these modes remains to be explored.…”