
1) Atmospheric optical phenomena 2) Scenic beauty of Mont Blanc
Found on
https://www.crosswordclues.com/clue/alpenglow

Alpenglow (from German: Alpenglühen) is an optical phenomenon in which a horizontal red glowing band is observed on the horizon opposite to the sun. This effect occurs when the Sun is just below the horizon. Alpenglow is easiest to observe when mountains are illuminated but can also be observed when the sky is illuminated through backscattering. ...
Found on
http://en.wikipedia.org/wiki/Alpenglow

reddish glow appearing at sunrise or sunset in mountains
Found on
http://phrontistery.info/a.html

• (n.) A reddish glow seen near sunset or sunrise on the summits of mountains; specif., a reillumination sometimes observed after the summits have passed into shadow, supposed to be due to a curving downward (refraction) of the light rays from the west resulting from the cooling of the air.
Found on
http://thinkexist.com/dictionary/meaning/alpenglow/
Al'pen·glow` noun A reddish glow seen near sunset or sunrise on the summits of mountains; specif., a reillumination sometimes observed after the summits have passed into shadow, supposed to be due to a curving downward (refraction) of the light rays from the west resulting from the cooling of the air.
Found on
http://www.encyclo.co.uk/webster/A/62

The rosy hue of mountains glowing at sunrise or sunset.
Found on
https://snowslang.com/glossary/

a reddish glow often seen on the summits of mountains just before sunrise or just after sunset.
Found on
https://www.infoplease.com/dictionary/alpenglow
No exact match found.