The source of the Halo is maybe the testing of a missile, due to a fuel dump from a Minuteman III missile, which had launched from Vandenberg AFB just minutes before. This has happened at least once before, and was also shortly after a missile launch. The third stage of the missile opens up ports on the side that dump the fuel, which then rapidly expands in the near vacuum of the upper atmosphere, causing the bubble of light.
Another possibility is that military or astronomers testing a laser. Astronomers use lasers to simulate a fake star, this "laser guide star" is need to adjust the adaptive optics.
Or the strange halo may be caused by something unknown?
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