The change of sky colour at sunset (red nearest the sun, blue furthest away) is caused by Rayleigh scattering by atmospheric gas particles which are much smaller than the wavelengths of visible light. The grey/white colour of the clouds is caused by Mie scattering by water droplets which are of a comparable size to the wavelengths of visible light.

The change of sky colour at sunset (red nearest the sun, blue furthest away) is caused by Rayleigh scattering by atmospheric gas particles which are much smaller than the wavelengths of visible light. The grey/white colour of the clouds is caused by Mie scattering by water droplets which are of a comparable size to the wavelengths of visible light.

Rayleigh & Mie Scattering by Epyon MX, via Flickr

Rayleigh & Mie Scattering by Epyon MX, via Flickr

Emerald & Ash Mie Scattering

Emerald & Ash Mie Scattering

Glory (also called anticorona) around the plane shadow flying out of Fargo around 4 PM on January 20, 2017.  It is caused by backward Mie scattering of the water droplets in the cloud.  In order to return directly to the observer, the light must duct along the surface of the drop.

Glory (also called anticorona) around the plane shadow flying out of Fargo around 4 PM on January 20, 2017. It is caused by backward Mie scattering of the water droplets in the cloud. In order to return directly to the observer, the light must duct along the surface of the drop.

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