Rayleigh scattering (mostly) results in a blue sky (Diffuse_sky_radiation) as seen from Earth's surface. Go up in a plane to cruise altitude and the sky gets noticeably blue-er, and then darker.

The scale height of the Earth's atmosphere is roughly 8 kilometers, which means that half of Earth's atmosphere's mass is below about 5.5 km, again roughly.

Question: Does half of a blue sky's blue light come from this lower 5.5 kilometers as well, or does the effect vary with density such that a disproportionate amount is coming from higher altitudes?

Origin of this question is from comments below @Ingolifs' answer to Puzzler: help understanding these amazing Curiosity eclipse GIFs


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