meteor, green atmosphere
Taken by KooKooLic on May 29, 2016 @ North Window @ Arches National Park, Moab, UT
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I'm from California and new to photography, just bought my first SLR (a Sony a6000) 8 months ago. As I ventured out hoping to capture the milky way a few nights ago in Moab, UT, this slow moving object (lasted ~4sec) took me by surprise. I was just setting up my camera, doing a test shot with 13s exposure. At 12:06am (MST), it came in from the right and I thought it was a plane at the first second or two, then it became bigger and brighter towards me. I realized it's moving much faster than a plane. Still wondering what it was (ufo? meteor?)..., then it started to move across showing a tail with big bright front. It must be a meteor, and I was dumbfounded to catch it on camera! (Wished it was on video mode to show you all) At the end, the front tip broke off like a space rocket detaching the booster, and both pieces just burnt off in our atmosphere. It was a crazy start for the night. Then, (40mins later) a couple of wolves started to howl, as the green light intensified over the south and southwest side of the sky. I know we don't get aurora at this latitude, esp when the Kp-index was low. Can you tell me what was this green atmosphere that got picked up by the camera & perhaps the wolves were howling at as well? The pictures were straight out from my camera, haven't got the chance to edit them yet.
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The green is from Earths airglow layer - take a look at images of the Earths limb from the International Space Station when it is on the dark side, and you will see a green curve perfectly concentric with our planets curve. EUV radiation from the sun excites oxygen atoms at similar altitudes to the aurorae, and at night releases it. You can see green airglow with the naked eye if it is bright enough from dark sky sites, like from where you shot these images.

DZ
Posted by owleye1 2016-06-01 17:35:04
 
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