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Hi, Steven,
This is really good juicy stuff. I like the science and what you are attempting. The article seems to show that there is no outer "edge", just as the sun's 'atmosphere' effectively extends to Pluto and beyond, just getting thinner and thinner. So the job becomes showing that at some given distance, the image is statistically significantly brighter than the background. That means getting a really good image of the background.
That in turn means a really cold chip, really good flats (that's where I fall down!), and an incredibly dark sky, so no thin cirrus, no moon, and photographing high above the horizon out of the mirk and skyglow.
Avoiding these sources of artifact might be even more important than long subs and a deep stack.
Good project and well worth doing.
Best,
Mike
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