Ocean tidal flows, like winds are created by gradients too, in this case, gravity gradients. but in this thread, it is asserted as an alternative theory, that the gradient between the cycloidal action of orbital and rotational velocity differences are also standing wave gradients. here is an item showing that solar heat too , acting on rotating body, Venus in this case, creates standing (at the evening side) atmospheric waves: Hokkaido University. "Atmospheric tidal waves maintain Venus' super-rotation." ScienceDaily. ScienceDaily, 23 April 2020. <www.sciencedaily.com/releases/2020/04/200423143050.htm>. "--the super-rotation' on Venus is maintained near the equator by atmospheric tidal waves formed from solar heating on the planet's dayside and cooling on its nightside."