THE VORTEX FIREBALL THEORY
EXPERIMENT TO EXPLAIN UFOs and BALL LIGHTNING

The experiment demonstrates for the first time in combustion in an atmospheric-like vortex undergoing vortex breakdown. This phenomenon may exist in the atmosphere. Past observations seem to indicate that the effect does exist in nature. This phenomenon is the main idea of Coleman (1993) and is used as the basis of a theory for several UFO sightings and as a theory for ball lightning. A detailed account of the theory is available in the book Ball Lightning a Scientific Mystery Explained published by Fireshine Press in 1997. THE AGE-OLD MYSTERY OF UFOs IS FINALLY SOLVED.
The first publication of the theory is by
Coleman (1993) Weather

A flaming tapering LPG  cylindrical flame inside the vortex breakdown region of a vortex. The chamber diameter is 0.9 meter. The vane angle from the radial direction is 40 degrees.
EXPERIMENTAL WORK conducted at Canterbury University and Lincoln University New Zealand in  1998.
THE EXPERIMENTAL CHAMBER FOR THE EXPERIMENTS CONDUCTED IN 1998 AT CANTERBURY UNIVERSITY CHEMICAL AND PROCESS ENGINEERING DEPT.
LPG gas burning in the vortex breakdown region of a vortex inside of a vortex chamber 0.9 meter diameter. The vane angle was 66 degrees. This imparts a more rounder flame than for 40 degrees (see above). Note that several shapes of  ball lightning has been reported including cylindrical and the classic spherical shape. 
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