Questions tagged [corona]

The corona is the large field of plasma surrounding a star, normally only visible when the star is fully eclipsed by another heavenly object. For questions about the sun or any other star's corona.

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Data of Coronal Holes

I'm working on the Evolution of coronal holes for which I need data of Coronal Holes, I have searched on internet and also done literature survey but didn't find out any open-source catalogue where I ...
Autodidact's user avatar
3 votes
1 answer

Density of Plasma in Solar Corona

The Sun's atmosphere, also known as the solar corona, is known to be extremely hot, much hotter than the Sun's surface. What is the plasma density in the solar corona?
Junaid Ihsan's user avatar
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Did astronomers "track back" solar wind switchbacks to the surface of the Sun to individual convection cells?

The new NASA Goddard video NASA's Parker Solar Probe Touches The Sun For The First Time explains that the spacecraft passed many times through "switchbacks" or kinks in the solar wind, where ...
uhoh's user avatar
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9 votes
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The Sun's Alfvén critical surface; what was known about its existence and location before Parker Solar Probe "touched the Sun"?

The new NASA Goddard video NASA's Parker Solar Probe Touches The Sun For The First Time seems to suggest that the existence of the Sun's Alfvén critical surface was a given, but the location and ...
uhoh's user avatar
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2 votes
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Physical properties of the stellar corona?

I am after the basic physical properties of the corona of a star, here some questions for which I would like to have an answer, even only for a subset of them: I know some things about the corona of ...
B--rian's user avatar
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4 votes
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Why is solar corona in visible light filamentary?

There is a video on YouTube (unfortunately in Czech) where Miloslav Druckmüller talks about structure of the solar corona in visible light. He explains that the filaments, clearly visible on his ...
Leos Ondra's user avatar
4 votes
5 answers

Can one see a black hole?

Can one see a black hole on earth? If a black hole does not emit light, how can one take a picture of the black hole itself? There's some discussion that the image composed by the Event Horizons ...
Ebai Emmanuel Ewangi's user avatar
5 votes
1 answer

Why does the solar wind switch to flowing straight by the time it reaches Earth?

Between 02:01 and 02:29 the new NASA Goddard video 5 New Discoveries from NASA's Parker Solar Probe explains finding # 4, A ...
uhoh's user avatar
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2 votes
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How could the polarizer in early coronagraphs make the Sun's corona more visible against the daytime sky?

Wikipedia's Coronagraph; Invention says: High Altitude Observatory's Mark IV Coronagraph on top of Mauna Loa, uses polarization to distinguish sky brightness from the image of the corona: both ...
Sartem Cacartem's user avatar
2 votes
2 answers

Would the solar corona be visible from the distance of the outer planets?

If the photosphere was blocked, before the sun rises on an airless moon in the outer solar system, would either the inner or outer corona be visible to the naked eye?
Bob516's user avatar
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4 votes
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What is the science behind the polar light shapes

Is there any scientific explanation that causes polar lights (aurora borealis/australis) to have their unique shapes? Specifically: Rayed Arcs Dual Bands Corona (Images on NASA Pdf) This site (by ...
Murad Babayev's user avatar