Does the Coriolis effect occur in a vacuum?

Sure, it has nothing to do with an atmosphere, other than the fact that an atmosphere is subject to the same forces that would affect any other particles having a mass. read more

Yes, Coriolis Effect can occur in vacuum as the atmosphere particularly do not matter. Because, the Coriolis effect is simply the apparent deflection of moving objects when they are viewed from a rotating frame of reference. read more

The Coriolis ‘force’ depends on the rate of change of the angular momentum (= mass x angular-velocity x distance-from-axis) of a geostationary object as you move along the surface of the Earth. This angular momentum varies as the square of the distance from the Earth’s axis. read more

Imagine a low-pressure system as a vacuum that sucks all the surrounding air straight towards it, creating many vectors of wind that all focus on one spot. Because of the Coriolis effect, each of these vectors gets twisted to the right, which in turn creates a counterclockwise flow. read more