I was working through some images that I had taken on my one and only visit to Rainbow Canyon when the military was still flying through that part of region. One of the shots that caught my eye was this one of a Super Hornet. It had passed me and was heading down towards the valley. This involved a few tight pulls around the curves in the canyon. A strong trailing vortex changes the density of the air which affects the refractive index. This distortion of the light makes the vortex visible if only by impacting the view of whatever is behind it. A good view of that effect can be seen in this shot.