Is wake turbulence from an aircraft confined to its altitude or does it propagate up or down? If I am in, say, an A319 and an A380 passes 1,000 feet above or below would I suspect to encounter turbulence?
The wake always moves down. At cruise altitudes, it settles at about 800 to 1000ft below its initial altitude, so it's possible (but rare) to get some wake effect from another aircraft.