APOD: STEVE: A Glowing River over France (2024 Oct 28)

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Expand view Topic review: APOD: STEVE: A Glowing River over France (2024 Oct 28)

Re: APOD: STEVE: A Glowing River over France (2024 Oct 28)

by caleb665 » Thu Oct 31, 2024 11:25 pm

STEVE is like the universe's secret art show, where glowing rivers of ions paint the night sky in mesmerizing colors.

Re: APOD: STEVE: A Glowing River over France (2024 Oct 28)

by johnnydeep » Mon Oct 28, 2024 6:21 pm

Ann wrote: Mon Oct 28, 2024 12:13 pm
...
APOD Robot wrote:
...

Rivers on Earth flow at different altitudes, that much is certain!
...

And things flow in the universe too. The filaments of dark matter and galaxies are the rivers of rivers!

Ann
But those filaments seem more like boundaries than flowing rivers. On the other hand, streams of galaxies are clearly flowing toward the Great Attractor!

Re: APOD: STEVE: A Glowing River over France (2024 Oct 28)

by Chris Peterson » Mon Oct 28, 2024 1:58 pm

Guest wrote: Mon Oct 28, 2024 1:21 pm I like the arts and artsy photos but this is a science site that many people who don’t know anything about astronomy learn from. They shouldn’t be posting photos of things in a straight line that show as bent.
So you would prefer that the horizon be shown as bent? You can't project a sphere onto a plane without distorting something. You've been living with it with every map of Earth you've ever used!

Re: APOD: STEVE: A Glowing River over France (2024 Oct 28)

by Guest » Mon Oct 28, 2024 1:21 pm

I like the arts and artsy photos but this is a science site that many people who don’t know anything about astronomy learn from. They shouldn’t be posting photos of things in a straight line that show as bent.

Re: APOD: STEVE: A Glowing River over France (2024 Oct 28)

by Ann » Mon Oct 28, 2024 12:13 pm


STEVE looks like a rainbow that's all red, although I'm not sure that the arc seen in the APOD is the true shape of the STEVE.
APOD Robot wrote:

Details of how STEVEs work remain a topic of research, but recent evidence holds that their glow results from a river of hot ions flowing over a hundred kilometers up in the Earth's atmosphere: the ionosphere.

Rivers on Earth flow at different altitudes, that much is certain!


And things flow in the universe too. The filaments of dark matter and galaxies are the rivers of rivers!

Cosmic web Illustris TNG.png
The cosmic web. Illustris TNG simulation.
Ann

APOD: STEVE: A Glowing River over France (2024 Oct 28)

by APOD Robot » Mon Oct 28, 2024 4:05 am

Image STEVE: A Glowing River over France

Explanation: Sometimes a river of hot gas flows over your head. In this case the river created a Strong Thermal Emission Velocity Enhancement (STEVE) that glowed bright red, white, and pink. Details of how STEVEs work remain a topic of research, but recent evidence holds that their glow results from a fast-moving river of hot ions flowing over a hundred kilometers up in the Earth's atmosphere: the ionosphere. The more expansive dull red glow might be related to the flowing STEVE, but alternatively might be a Stable Auroral Red (SAR) arc, a more general heat-related glow. The featured picture, taken earlier this month in Côte d'Opale, France, is a wide-angle digital composite made as the STEVE arc formed nearly overhead. Although the apparition lasted only a few minutes, this was long enough for the quick-thinking astrophotographer to get in the picture -- can you find him?

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