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I believe they would not be visible to the naked eye from the ground, but if they were, would appear to be a brighter spot. They show up dark in the part of the spectrum used by the satellites.

Well ok, the one thing that has me totally confused is if these holes/shadows are in fact "water balloons", their "mark", upon explosion, would be in the visible light range would they not? I mean, we're talking a hole/shadow created by water vapor, and it wouldn't require cameras fitted with spectral capabilities to see these shadows would it? UNLESS these holes/shadows are so faint so as to NOT be visible in, er, visible light? Near as I can tell, none of these observations were conducted in the visible light range.

One other thing that comes to mind. I'm sure you've seen the clips taken of thunderstorm activity on the dark side of the planet from orbiting spacecraft, I believe, that show what appear to be jets(poor choice of word, but the best that comes to mind) of material escaping FROM the earth. Now it occurs to me that these "jets" could maybe just as easily create a hole/shadow in the atmosphere??? As far as I know, these jets have not been adequately explained. Could they be related?

FGS