Physics & Spacearticle2026-09-23

Gravitational torque drives multidecadal variations in length of day

Open access2 citations

Abstract

Multidecadal fluctuations in Earth’s length of day are shown to be driven by gravitational torque and resisted by electromagnetic and topographic forces, improving our understanding of the material properties and dynamics of Earth’s deep interior.

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Authors: Huifeng Zhang, Mathieu Dumberry

Institutions: University of Alberta