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Old 01-27-2016, 11:07 PM   #1
xoxoxoBruce
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Jan 28th, 2016: Airglow

APOD says, "Why would the sky look like a giant fan? Airglow."



Quote:
The featured intermittent green glow appeared to rise from a lake through the arch of our Milky Way Galaxy, as captured last summer next to Bryce Canyon in Utah, USA. The unusual pattern was created by atmospheric gravity waves, ripples of alternating air pressure that can grow with height as the air thins, in this case about 90 kilometers up.
Unlike auroras powered by collisions with energetic charged particles and seen at high latitudes, airglow is due to chemiluminescence, the production of light in a chemical reaction. More typically seen near the horizon, airglow keeps the night sky from ever being completely dark.
Got that, man, chemicals make you see colors.

Of course some people don't buy that chemiluminescence story, they're sure it's aliens trying to hide stuff from us. What stuff? This stuff.


Could be, man, could be.
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Old 01-28-2016, 06:45 AM   #2
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Cool stuff.

Oh, and keep your eye on Andromeda - its heading our way at about 250,000 mph.
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Old 01-28-2016, 07:19 AM   #3
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And this is why, after discovering the link here, I have read every single accessible entry on APOD (which goes back into the 1990s)! Did the same thing with this thread long before signing up . Due to my (thankfully) mild OCD, my morning routine is crucially important to me and the webcomics and image blogs I read are the pillars of that routine.
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Old 01-28-2016, 07:24 AM   #4
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A lake next to Bryce Canyon, huh? I'm going to have to be off to google earth for a minute. I can't picture any lakes anywhere near Bryce.
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Old 01-28-2016, 07:27 AM   #5
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OK. So there's a reservoir that supplies Tropic with drinking water. Probably the Bryce visitor center too. It's probably that reservoir.

And there's a nice campground right next to that reservoir. It would be good overflow for the National Park.
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Old 01-28-2016, 10:23 AM   #6
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I used to hit APOD every day. Posted a lot of pics from that site.

Don't know how/why I got away from it...Heading there now.

Very cool pic, Bruce.
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Old 01-28-2016, 10:25 AM   #7
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Or it could be Pine lake.
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Old 01-28-2016, 10:42 AM   #8
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I approve this image as the iotd for my birthday.
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Old 01-28-2016, 11:02 AM   #9
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happy birthday, bbro!
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Old 01-28-2016, 11:32 AM   #10
xoxoxoBruce
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Happy Birthday on You
Happy Birthday on You
Happy Birthday all over You
Happy Birthday on You

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Old 01-28-2016, 12:00 PM   #11
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Thanks guys
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