A silver metallic disc rising vertically from the ground.

On my way to work I saw off to my right a silver metallic disk like craft rising vertically from the ground. It seemed to be half a mile away rising from an open field. I watched it until the nearby woods obscured it. Once I got clear of the trees I stopped to look for it but it was gone. The disc was flat with a slight bulge in the center top. I could see the sunlight reflecting off the outside. I drove back and forth the same way the same time over several days trying to see if it was caused by the rising sun but I never saw anything like it again.