Dave Pike imaged this scene in the Scottish Highlands.
A narrow band of the distant hillside appears strongly miraged where rays from it graze the nearby snowy slope.
The snow surface has radiatively cooled overnight and has in turn cooled air close to it. The mirage is produced by refraction across the temperature gradients between the cold air and warmer air above.
We have in effect a mini superior mirage or even a Fata Morgana.
Image ©Dave Pike, shown with permission
Formation of a classical superior mirage.