Sunrise on Nov 18, 2016The sunrise was captured with a sky surveillance camera pointing to west.
Sunlight is scattered by particles in the atmosphere (Rayleigh scattering). This effect is stronger for shorter wavelengths. That's why the sky is blue (the blue light is scattered sunlight) and why the sun looks yellow to red (the remaining light which was not scattered). This filtering effect becomes more intense if the way of the light through the atmosphere is longer, i.e. if the sun is close to horizon.
The display depicted below is caused by reddish sunlight which illuminates clouds from the bottom side.
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