Comments and questions about the
APOD on the main view screen.
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Ann
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by Ann » Tue Aug 13, 2024 8:55 am
Thanks, Jac, for inviting us to this magic world above the clouds inhabited by electrical discharges, sprites, elves, ghosts and trolls! Let alone the blue jets and the gigantic jets!
The APOD is nice, but I think it show us rather too much background and a too small-looking gigantic jet! Although the gigantic jet itself does look fantastic, like a neon-colored mushroom growing out of the cloud cover of the Earth.
I get that the green layer of the atmosphere is airglow. But why is the atmosphere beneath the green airglow-layer bronze-colored? Is it due to air pollution?
Ann
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Chris Peterson
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by Chris Peterson » Tue Aug 13, 2024 9:39 pm
Ann wrote: ↑Tue Aug 13, 2024 8:55 am
The APOD is nice, but I think it show us rather too much background and a too small-looking gigantic jet! Although the gigantic jet itself does look fantastic, like a neon-colored mushroom growing out of the cloud cover of the Earth.
To me that makes the gigantic jet look even more so, what with the entire atmosphere visible and the curvature of the Earth.
I get that the green layer of the atmosphere is airglow. But why is the atmosphere beneath the green airglow-layer bronze-colored? Is it due to air pollution?
That's the sodium layer.
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Ann
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by Ann » Wed Aug 14, 2024 3:28 am
Chris Peterson wrote: ↑Tue Aug 13, 2024 9:39 pm
Ann wrote: ↑Tue Aug 13, 2024 8:55 am
The APOD is nice, but I think it show us rather too much background and a too small-looking gigantic jet! Although the gigantic jet itself does look fantastic, like a neon-colored mushroom growing out of the cloud cover of the Earth.
To me that makes the gigantic jet look even more so, what with the entire atmosphere visible and the curvature of the Earth.
I get that the green layer of the atmosphere is airglow. But why is the atmosphere beneath the green airglow-layer bronze-colored? Is it due to air pollution?
That's the sodium layer.
You mean light pollution? Due to sodium lamps?
Ann
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Chris Peterson
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by Chris Peterson » Wed Aug 14, 2024 4:39 am
Ann wrote: ↑Wed Aug 14, 2024 3:28 am
Chris Peterson wrote: ↑Tue Aug 13, 2024 9:39 pm
Ann wrote: ↑Tue Aug 13, 2024 8:55 am
The APOD is nice, but I think it show us rather too much background and a too small-looking gigantic jet! Although the gigantic jet itself does look fantastic, like a neon-colored mushroom growing out of the cloud cover of the Earth.
To me that makes the gigantic jet look even more so, what with the entire atmosphere visible and the curvature of the Earth.
I get that the green layer of the atmosphere is airglow. But why is the atmosphere beneath the green airglow-layer bronze-colored? Is it due to air pollution?
That's the sodium layer.
You mean light pollution? Due to sodium lamps?
Ann
No, a layer of sodium atoms at the top of the atmosphere which comes from meteors. It's what active adaptive optics systems on big telescopes shine their lasers on to create artificial stars. We see it in most images from space that show the atmosphere edge on like this.
https://en.wikipedia.org/wiki/Sodium_layer
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Ann
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by Ann » Wed Aug 14, 2024 4:44 am
Chris Peterson wrote: ↑Wed Aug 14, 2024 4:39 am
Ann wrote: ↑Wed Aug 14, 2024 3:28 am
Chris Peterson wrote: ↑Tue Aug 13, 2024 9:39 pm
To me that makes the gigantic jet look even more so, what with the entire atmosphere visible and the curvature of the Earth.
That's the sodium layer.
You mean light pollution? Due to sodium lamps?
Ann
No, a layer of sodium atoms at the top of the atmosphere which comes from meteors. It's what active adaptive optics systems on big telescopes shine their lasers on to create artificial stars. We see it in most images from space that show the atmosphere edge on like this.
https://en.wikipedia.org/wiki/Sodium_layer
Thanks!
Ann
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johnnydeep
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by johnnydeep » Wed Aug 14, 2024 12:05 pm
So, the green arc is airglow, but what about the large amorphous green blob toward the bottom of the frame?
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Fred the Cat
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by Fred the Cat » Wed Aug 14, 2024 2:10 pm
johnnydeep wrote: ↑Wed Aug 14, 2024 12:05 pm
So, the green arc is airglow, but what about the large amorphous green blob toward the bottom of the frame?
Sewer gas?
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