Pictures and movies that fighter aircraft can see better elliptical clouds emitting near the speed of sound

It is a mysterious elliptical cloud picture and movie that occurs when a fighter plane reaches near the speed of sound (1225 km / h). This cloud is "Prandtl-Glauert Singularity "What can be explained with. "The pressure coefficient increases and decreases rapidly as it approaches sound speed, and water vapor contained in the surrounding air condenses due to adiabatic expansion" and it seems to occur.

Details are as below.
Picture from the front
Another Halo on Flickr - Photo Sharing!


I feel mysterious
BOOM! On Flickr - Photo Sharing!


You see a very beautiful cloud
Seeing a Sonic Boom - How often? On Flickr - Photo Sharing!


A movie being taken quite close. It is very impressive.
YouTube - F14 - Supersonic Fly By WOW!


A blast can be heard in the middle of the movie, but this is "Sonic Boom". At the time of playback, a big plosive sound will be played, so please be careful with the volume.
YouTube - Sonic BOOM!