APOD: Airglow Ripples over Tibet (2022 Nov 20)

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APOD Robot
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APOD: Airglow Ripples over Tibet (2022 Nov 20)

Post by APOD Robot » Sun Nov 20, 2022 5:07 am

Image Airglow Ripples over Tibet

Explanation: Why would the sky look like a giant target? Airglow. Following a giant thunderstorm over Bangladesh in late April, giant circular ripples of glowing air appeared over Tibet, China, as pictured here. The unusual pattern is created by atmospheric gravity waves, waves 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.

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VictorBorun
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Re: APOD: Airglow Ripples over Tibet (2022 Nov 20)

Post by VictorBorun » Sun Nov 20, 2022 1:30 pm

posted link chemiluminescence is in fact about the afterglow and is informative but with little infographics
Last edited by VictorBorun on Sun Nov 20, 2022 9:52 pm, edited 1 time in total.

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orin stepanek
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Re: APOD: Airglow Ripples over Tibet (2022 Nov 20)

Post by orin stepanek » Sun Nov 20, 2022 1:34 pm

rippledsky_dai_960.jpg
Beautiful; Gravity waves create circular rings in the atmosphere! 8-)
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Re: APOD: Airglow Ripples over Tibet (2022 Nov 20)

Post by JMan50 » Sun Nov 20, 2022 2:04 pm

Be advised that Tibet should not be shown as part of China. It was illegally taken over and annexed. It should alsways be listed as an independent country.

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Re: APOD: Airglow Ripples over Tibet (2022 Nov 20)

Post by De58te » Sun Nov 20, 2022 4:27 pm

Sometimes the APOD information isn't 100% accurate. Here they say the giant thunderstorm over Bangladesh we assume happened in late April, 2022. However the Flickr link says that the photo was taken on April 27, 2014. So most likely the Bangladesh storm also took place in 2014 rather than in April this year.

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bystander
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Re: APOD: Airglow Ripples over Tibet (2022 Nov 20)

Post by bystander » Sun Nov 20, 2022 4:43 pm

De58te wrote: Sun Nov 20, 2022 4:27 pm Sometimes the APOD information isn't 100% accurate. Here they say the giant thunderstorm over Bangladesh we assume happened in late April, 2022. However the Flickr link says that the photo was taken on April 27, 2014. So most likely the Bangladesh storm also took place in 2014 rather than in April this year.
Actually, it never said April, 2022. It just said April. They probably should have said 2014,
but as per usual for a Sunday, this APOD is a repeat. This one is from 2014 Sept 01.
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