Careful:
Note the difference between the angles that sunlight is taking in that photograph. Also note where things like clouds are. Just because blue is coming from the "upper atmosphere" regions in that photo doesn't mean it's not also strongly coming from the "lower atmospheric" regions there.
________________________________
From: Bob Sciamanda <treborsci@verizon.net>
To: Bob Sciamanda <treborsci@verizon.net>; PHYS-L <phys-l@phys-l.org>
Sent: Thursday, August 22, 2013 7:08 AM
Subject: Re: [Phys-L] Where is the sky?
This gives an answer to my query by asserting that only the UPPER atmosphere
produces the blue sky of scattered sunlight. ==>
-----Original Message-----
From: Bob Sciamanda
Sent: Sunday, August 18, 2013 10:50 PM
To: PHYS-L
Subject: [Phys-L] Where is the sky?
How is it that the blue sky of scattered sunlight appears to come from a
highly localized source confined to a distant hemispherical surface? Does
not the entire atmosphere participate in this scattering?