However one could argue that this test was a simulation of the flight of the Enterprise where the Mach number of the flow is analogous to the Warp speed of the vehicle. Our test had a Mach number of around 5, or about half the full capabilities of the Enterprise. An image that we recorded at this speed can be seen below. This was taken with a digital camera open to luminosity from the flow throughout the test. Note the highly intense regions in front of the blunt sections of the vehicle.
Flow is left to right.
A more quantitative study of the flow was done using holographic interferometry. An interferogram yields a picture with light and dark bands called fringes. Where these fringes bend indicates a change in the density of the gas. The image below shows diagonal lines coming from the front of the Enterprise - these are the bow shock waves. Shocks are also seen emanating from other points on the vehicle.