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Jan 28th, 2016: Airglow
APOD says, "Why would the sky look like a giant fan? Airglow."
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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. |
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.
Beestie Thursday Jan 28 07:45 AM
Cool stuff.
Oh, and keep your eye on Andromeda - its heading our way at about 250,000 mph.
Snakeadelic Thursday Jan 28 08:19 AM
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.
glatt Thursday Jan 28 08:24 AM
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.
glatt Thursday Jan 28 08:27 AM
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.
Gravdigr Thursday Jan 28 11:23 AM
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.
xoxoxoBruce Thursday Jan 28 11:25 AM
Or it could be Pine lake.
bbro Thursday Jan 28 11:42 AM
I approve this image as the iotd for my birthday.
glatt Thursday Jan 28 12:02 PM
happy birthday, bbro!
xoxoxoBruce Thursday Jan 28 12:32 PM
Happy Birthday on You
Happy Birthday on You
Happy Birthday all over You
Happy Birthday on You
bbro Thursday Jan 28 01:00 PM
Thanks guys 
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