Hmmm....you may be right.
Perhaps lasers triangulated around the Dome and synchronized to a common focus directly above it. They ignite the air high up, then are brought down toward the Dome for 20-odd seconds. Maybe then the angle is increased and the lasers are simultaneously turned skyward. That could explain the speed—it’s essentially changing the angle of a laser pointer a few degrees.
I dunno how to answer the luminosity point. But that thing is fluctuating like a fire and not steady like a solid luminescent object.
Or of course it could be extraterrestrial or supernatural. :)
Next to simple a hoax of multiple videos created by collaborating hoaxers, it would be my best guess. The link above about generators being brought to the general location lends credence to the laser theory, IMO.
I’m not familiar with any wavelength of light that would be absorbed by air like that (and not until a specified point tens of meters from the source). It could illuminate and burn something ELSE at that point in the sky, but not just air.