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The cone can appear only above the speed of sound. The faster the plane flies past the speed of sound the sharper (and more faint) the cone is going to look (sharper angle that is). Theoretically if the plane is "breaking the speed of sound" therefore traveling at the speed of sound, there will not be any cone, just a straight plain (wall) of condensed water (claud), perpendicular to the movement of the plane. The cone effect is caused by the overlapping circles of sound waves. The peak of the cone is going to be the source of sound, mainly the jet engine. As long as the plane is traveling above the speed of sound, the jet is always ahead of the sound waves it produces, and because sound waves are traveling in all directions from the source (imagine expending circle), every "next" sound wave is going to interfere with the previous one. This interference causes the "boom" effect, and if the air is humid enough you see a perfect cone of momentarily condensed water in the air. The cause of condensation is increased air pressure in the path of these sound wave interferences. …the cone actually gives you a visual representation of the sonic boom, so a person standing close enough to be enveloped by this cone would hear a boom in the exact moment the surface of the cone reaches him J Oh, and the only reason why the cone appears and disappears is the inconsistency of air humidity. Sorry for such a long and perhaps hard to follow explanation. Hope it makes sense J

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