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   Undertoad  Tuesday Jun 1 01:13 PM

6/1/2004: Green flash at sunrise



This Earth sci pic of the day shows an actual phenomenon - where the Sun's light, traveling through a lot of Earth atmosphere, gets "squashed" and separated until it looks like this. I can't remember ever seeing it this squished...



lookout123  Tuesday Jun 1 03:21 PM

that is a beautiful shot. i'm sure there are evil rays of death (technical term) meant to cook our brains found with this phenomenon?



Troubleshooter  Tuesday Jun 1 03:32 PM

Quote:
Originally posted by lookout123
that is a beautiful shot. i'm sure there are evil rays of death (technical term) meant to cook our brains found with this phenomenon?
If you follow it up it looks like the red, orange, yellow, green part of the spectrum.


chrisinhouston  Tuesday Jun 1 05:10 PM

There are some other good photos at http://mintaka.sdsu.edu/GF/pictures.html



xoxoxoBruce  Tuesday Jun 1 05:54 PM

Didn't Henry Fonda talk about the green flash in, "On Golden Pond"?



mrputter  Tuesday Jun 1 09:28 PM

<EM>> it looks like the red, orange, yellow, green part of</EM>

Well, that kinda makes sense to me. Given the curvature of the Earth, the sun's rays are hitting the atmosphere at different angles as you move up from the horizon, and since the different bands of the spectrum have different refractive indices, you'd be getting a different colour band being refracted towards the camera at the different angles.

So in other words, the Earth's atmosphere is basically acting as a giant prism (or lens, depending on how you look -- har, har -- at it) in this picture.



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