A new analysis on this phenomenon made by 1967 Sander of YouTube shows energy fields in and around a UFO/Orb filmed at Area 51.
Look at the bottom. Can you see the waves moving from the center of the UFO to the bottom, while the other areas are less showing these waves.
Also when these waves appear there is increased activity (red glow) underneath the UFO.
Related: The UFO Enigma of Flying Spheres (A stunning selection of authentic video footage of flying Orbs and Spheres)
Update June 3, 2014: Video is not available anymore.