Posted on 09/01/2014 12:50:51 PM PDT by SunkenCiv
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 above. 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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[Credit & Copyright: Jeff Dai]
Nice!
Sweet!
That’s something really special.... :)
I drove from Mexico City back to California a LONG time ago and saw all kinds of desert nights. When I crossed the border into the U.S. I felt safe enough to drive at night.
I hadn't seen those night lights since we went to a "dude ranch" in northern California. WHAT a night sky!
Earthlings! Pay no attention to the circles in the sky! They are NOT a reference point for an invasion from Mars. Now, go back to your futile existence.
Just WOW!
Stunning! Great APOD, Mr. Civilizations. Thank you so much.
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