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Anonymous
>The white halo is formed by condensed water droplets which are thought to result from a drop in air pressure around the aircraft (see Prandtl-Glauert Singularity). http://en.wikipedia.org/wiki/Sound_barrier
>The Prandtl-Glauert singularity (sometimes referred to as a "vapor cone"), is the point at which a sudden drop in air pressure occurs, and is generally accepted as the cause of the visible condensation cloud that often surrounds an aircraft traveling at transonic speeds, though there remains some debate. It is an example of a mathematical singularity in aerodynamics. http://en.wikipedia.org/wiki/Prandtl-Glauert_singularity
So, I think our guessing was right. Also, in the article says that after breaking the soun barrier the air resistance decreases: I would think that makes the plane increase his aceleration on that moment, and make the effect of the decompression more pronunced
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