Where is the phenomenon known as Alpenglow typically observed?

Answer

On high mountain peaks or clouds above the valley floor.

Alpenglow occurs when the sun, having already set for observers at lower elevations, still casts direct, low-angle light onto very high terrain features, often creating a striking reddish or pinkish illumination.

Where is the phenomenon known as Alpenglow typically observed?
skyatmosphereglowsunsettwilight