Kelvin wave

noun2

1. •
   A non-dispersive wave in the ocean or atmosphere that balances the Earth's Coriolis force against a topographic boundary such as a coastline, or a waveguide such as the equator.

   • Geophysicists have leaned on a mathematical explanation for equatorial Kelvin waves since the 1960s, but for some, that explanation wasn’t entirely satisfying. — 2023
2. •
   A long-scale perturbation mode of a vortex in superfluid dynamics.