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I "think" that on #1 that vapor cone is essentially a visual representation of the sound barrier. As speed increases that anomaly moves more rearward on the fuselage. It's when the aircraft separates from the cone that the sonic boom occurs and they break the sound barrier.
This is open to very loose interpretation as it's been too many years since aerodynamics 101 and being around them on a regular basis.
We were in the middle of an Operational Readiness Exercise at Mt Home AFB, ID. Was working on an F-111 engine when the alarm sounded and five mechanics dogpiled into a three man bunker.
Was looking up through my gas mask when a B-52 came over in a high speed pass at 200 feet with the bomb bay doors open.
When I lived in Key West a buddy of mine was a RAN in a Vigilante. He arranged for me to be on site at Boca Chica for the end of one of their training missions. I headed out to base one evening and went to a hangar where they did a brief safety review then loaded up 6 or 7 of us in a van and we headed out to the runway.
It was well after dark when the fun began; the runway was dark save for the meatball we were standing next to as the training flight of 4 aircraft came in and did repeated touch and go landings. Each one did 2 or 3 before completing the mission and the dark touch and go's were training for night ops on a carrier so we were literally 20 or so feet away from the wingtips as they went to full afterburner for their fly arounds. I know I've never seen or experienced anything cooler in my life!
During the pattern a set of landing lights appeared on final approach out of sequence; seems the local airline had a flight coming in on the Navy runway except that it was darkened, about 5 miles from the civil airport and at a 90 degree angle to KW International. Pretty obvious why the locals called it Air Sometimes in spite of Air Sunshine being painted on the fuselages.