8" x 10" 
Oil on wrapped canvas

When the sun is just below the horizon, a horizontal red glowing band can sometimes be observed on the opposite horizon. Alpenglow is easiest to observe when mountains are illuminated but can also be observed when the sky is illuminated through backscattering, according to Wikipedia. 

This is at Devil's Thumb Resort where I stayed in Colorado.  I was fascinated with the pink light cast back on the mountains after the sun had set.