What is the name of the phenomena...

What is the name of the phenomena (derived by scattering of the light) in which mountain tops acquire a rosy or orange hue around sunrise and sunset?

Brillouin scattering

Circle of confusion

Alpenglow

Barrel distortion

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What is the name of the phenomena (derived by scattering of the light) in which mountain tops acquire a rosy or orange hue around sunrise and sunset?

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