Talk:Stellar corona

Proposed merge of Corona (meteorology) into this article

- a mereorological corona is an entirely separate phenomenon from the solar corona.Its called beer!! Ever heard of it?!  --Urbane legend 11:06, 23 Jun 2005 (UTC)

Agreed. Seems like a completely nonsensical merge. — Wisq 11:58, 2005 Jun 23 (UTC)

As the person who created Corona (meteorology) by splitting material out from Corona (disambiguation), I naturally agree. --OpenToppedBus - Talk 13:53, Jun 23, 2005 (UTC)

Okay then, that's three against. Shall we get rid of the merge template? --Urbane legend 08:59, 24 Jun 2005 (UTC)

Kelvin and Celsius

In response to the revert: A Celsius-Kelvin comparison for only two measurements? When even the topic we're comparing it to (the photosphere) only lists kelvins for its temperature? The degrees comparison takes up as much space as the actual temperature comparison, and tells the reader nothing the respective articles don't already. I won't press the issue, but it seemk pretty pedantic. If the reader doesn't already know about kelvins, that's what the link is for. The main reason I edited it in the first place was because that bracketed thing really kills the flow. -- Wisq 16:31, 2005 Apr 29 (UTC)

Original research?

the world is yoursLuc Viatour

Fplay 01:32, 12 December 2005 (UTC)

sunspot

can you help me find some info—The preceding unsigned comment was added by 207.230.203.244 (talk • contribs) .

Coronal heating problem

Phonons conduct heat in metals, does fusion and or the density of mass inside a star affect the function of phonons? "Dulling" them so that the heat is present in the corona, and not at or below the surface? IDK. Thanks for reading. User: McTrixie --71.124.219.87 17:13, 27 August 2006 (UTC)

should have been in

I felt there should have been some information on solar flares, given off during corona,as they do reach thousands of miles into space,and is a main factor in this topic! Wongdai 09:08, 5 April 2007 (UTC)

How do we know the corona is hot?

The article asserts that the corona is thousands times hotter than the surface and then goes on to explain that there is no single accepted theory to explain it. The article fails to clarify how we even know that the corona is hotter in the first place. Precisely what observations lead astronomers to that temperature conclusion? — Timwi 15:41, 25 May 2007 (UTC)

It was determined by Bengt Edlén using spectroscopy. The demiurge 16:15, 25 May 2007 (UTC)

It can be determined using few methods. Primary and original method was the observation of high ionization of atoms by their absorption spectra, which can only occur at very high temperatures. Initially it was not know which atoms / elements these are, and even postulated to be some new element, but later using experiments in Earth labs, and using mathematics of quantum mechanics, it was determined these are pretty normal and expected elements, just at very high ionization state, thus high temperature. But the temperature can also be determined by Doppler broadening thermometry (using Doppler broadening of spectra peaks to measure temperature - as temperature increases, the average atoms velocities increase, thus the peaks are less sharp and becomes broader, by measuring it, the speed can be determined, and thus the temperature). The mathematical analysis (to also take into account other factors and sources of broadening, and in some situations narrowing) is a not trivial, but not too complex either really. 2A02:168:2000:5B:E5C5:F26D:B2D7:4CEF (talk) 14:21, 19 March 2021 (UTC)

The Corona Mystery

This article seems highly relevant:

http://dsc.discovery.com/news/2007/05/30/corona_spa_02.html?category=space&guid=20070530090000

It talks about the sound wave theory, with evidence I believe.

does anyone else think it important enough to include?

Meaning of "Corona"

Corona is a latin world; I remember the greek form στέφανον (stephanon) for "crown". Roberto

Not only that, but corona is a common word that means a lot of things, as can be seen by the disambiguation page. It's funny that no place does Wikipedia define the source of this wide-spread word, which, like you said - is "crown". Isn't it a particular type of crown?Jimhoward72 (talk) 18:32, 14 August 2011 (UTC)

A solved problem?

I took some solar physics 10 years ago (I'm really a cosmologist), and we did some pretty hefty math on the corona heating problem. I remember the conclusion was that it would be surprising if the corona had not been extremely hot, there is so much energy dumped there. But this being 10 years ago, I don't feel really up to the task of improving the article, but I feel that the "unsolved mysteries" tag is now inappropriate. Kjetil Kjernsmo (talk) 21:45, 12 September 2008 (UTC)

"unsolved problem in physics: Why is the Sun's Corona so much hotter than the Sun's surface?" the answer seems simple. perhaps the question is not the correct one to ask? the sun emits hot matter as discharges, etc, and space is a vacuum so heat cannot be transferred, there is little cooling. and the stuff stays up there. the colder stuff may sink. 01:44, 21 December 2011 (UTC) — Preceding unsigned comment added by 58.169.184.128 (talk)

Googling this problem gave this

http://www.livescience.com/13208-sun-mystery-explained-plasma-jets.html

Proof: http://i.imgur.com/c9pXALD.png

Does this mean it is solved? I don't have knowledge of this topic, sorry. --99.231.17.237 (talk) 04:14, 20 September 2016 (UTC)

I love kittens?

I changed it back to Spectral Features. Is this correct for the first section?

Bot-generated content

A computerised algorithm has generated a version of this page using data obtained from AlgaeBase. You may be able to incorporate elements into the current article. Alternatively, it may be appropriate to create a new page at Corona (alga). Anybot (contact operator) 18:09, 21 February 2009 (UTC)

Coronal seismology

Added new section on this. There is already a section on helioseismology (which I've been expanding lately) so it seemed appropriate. Puzl bustr (talk) 20:07, 23 November 2009 (UTC)

Kelvin vs. kelvins

So I noticed that the word kelvins was used several times in the article when referring to the unit kelvin. Now, I've taken several physics classes and we always refer to the unit in a singular form (kelvin), and use K or kelvin when writing it down, so I changed the kelvins for kelvin and K because I thought it more appropriate. I am not however really a 100% sure that kelvins in plural isn't correct as well. Koszmonaut (talk) 02:57, 27 June 2010 (UTC)

Corona as an electrical discharge

According to the view that plasma physics and electrical forces mainly shape the universe, the sun is a large cathode and the corona is due to negatively charged particles flowing into it.

http://www.benthamscience.com/open/toaaj/articles/V004/SI0162TOAAJ/165TOAAJ.pdf

The main source of solar energy is the corona and the interior of the sun is heated from the outside, leading to nuclear fusion.

I propose the following explanation. All regions of ionised plasma that collapse under gravity are subject to the equipartition of kinetic energy amongst plasma particles. Electrons in the plasma acquire much greater velocities than the protons as they are much lighter. In aggregate many more electrons than protons attain escape velocity and the remaining mass in the collapsing plasma becomes net positively charged. Therefore all stars are positively charged masses into which negatively charged particles flow, leading to electrical discharge in a very hot corona. This explains the emission of X-rays from the corona. — Preceding unsigned comment added by 205.228.82.138 (talk) Arvind Damarla

Picture Caption Phrasing

I feel like, "During a total solar eclipse, the solar corona can be seen by the naked eye." is bad wording because it makes it seem like staring at a solar eclipse is okay. Does anyone agree? — Preceding unsigned comment added by Thisaccountisbs (talk • contribs) 16:06, 12 May 2014 (UTC)

Missing Images/Video in Section 'A Solar Storm'

Video(s) and/or images of Solar Storm activity between October and November of 2003 are referenced in this article, however, these images and/or video(s) are not present in the article. Strongly suggest to edit the section accordingly to:

• Include the media in question,
• Provide an in-section direct link to the media(possible sub-header for the section?), or
• Change the phrasing of the article away from assuming the reader is viewing this media.
  

(response to above unsigned post starts here) The videos are missing because they were deleted from Commons due to copyright concerns. Presumably this means they can't be put back. I also discovered that a large chunk of the text was lifted directly from the same NASA site that the videos originally came from (without them being credited as the source, by the way). So if we were to include links to those videos, the text here would be rendered pretty much redundant. Should the section just be deleted, with maybe a reference added under External Links? 78.145.112.78 (talk) 08:00, 23 November 2015 (UTC)

I'd say delete the section. Phrasing and tone doesn't really fit the rest of the article. Will the Great (talk) 03:24, 29 January 2017 (UTC)

Resonant absorption -- useful when secondary source found?

"Solar physicists have captured the first direct observational signatures of resonant absorption, thought to play an important role in solving the "coronal heating problem" which has defied explanation for over 70 years.

"An international research team from Japan, the U.S.A., and Europe led by Drs. Joten Okamoto and Patrick Antolin combined high resolution observations from JAXA's Hinode mission and NASA's IRIS (Interface Region Imaging Spectrograph) mission, together with state-of-the-art numerical simulations and modeling from NAOJ's ATERUI supercomputer. In the combined data, they were able to detect and identify the observational signatures of resonant absorption." (http://www.sciencedaily.com/releases/2015/08/150824064742.htm)

-- Jo3sampl (talk) 01:49, 26 August 2015 (UTC)

External links modified

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Why are higher elements present at all?

The sun fuses hydrogen into helium. Yet this article refers to ionized higher elements like iron and carbon. Where do these come from? There's no explanation. Tmangray (talk) 04:09, 24 August 2017 (UTC)

The leading idea is that these elements are from before the formation of the Sun. Graeme Bartlett (talk) 23:31, 21 January 2018 (UTC)

To clarify further, the sun itself can form elements as heavy as iron through fusion (H+He->Li,Li+Li->C, etc.) and anything heavier must have come from supernovae or other cataclysmic cosmological processes. There are better places to ask questions like this, try google to start with. — Preceding unsigned comment added by Pearman831 (talk • contribs) 10:03, 3 February 2018 (UTC)

I think the question is about solar composition. Saying the Sun can produce this or that doesn't have any direct relevance to that. The question (imho) doesn't belong here but should addressed by the main page(s) about the Sun. (See there under "Composition" (for some odd reason, there is little about the protosolar nebula and the accretion of mass of the Sun during its pre-fusion period (i.e. before it lit up). There is, curiously, nothing about the Sun being a Population I star.)

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Hot in physics vs hot in everyday life

It would be great if someone could add a short paragraph outlining the difference between corona being really hot and what everyday objects being hot mean for laymen. If you blocked all the radiation from the Sun, would being inside the corona burn you to a crisp or would you freeze to death despite being inside a few million K region? How does the new solar probe survive the coronal temperatures of million K with a heat shield that only survives 1500K?

The corona has a very low density of about 1×10⁸ cm⁻³ or less and can not seriously heat a spacecraft. Ruslik_Zero 20:36, 11 August 2018 (UTC)

Muddled and weak.

I came here looking for solid information about the Sun's Corona. I am disappointed. The following is the best I can piece together (but may be way off): 1.) There is no precise definition of the Corona. 2.) The photographs (coronagraphs) show the K-Corona (mostly), and the photos only picture it extending to several million km. (which can be seen by simply looking at its size relative to the Sun). 3.) The E-Corona is superimposed over the K- (and I suspect F-) corona, it is not a (physically) separate structure.(although we can argue about what 'separate' means.) 4. The F-Corona extends far out into space and may include the Earth's orbit. (This one is unclear to me, my best guess is that since it (the F-) is caused by dust scattering sunlight, that it could be argued to extend as far out as the heliopause. 5.) The (only?) difference between the "Corona" and the Solar Wind is that the Solar Wind has "escaped" the Sun's gravity. The disance above the Sun this may occur depends on each particle's speed (and direction). An average H atom at 1 million degrees Kelvin will be traveling at escape velocity at ~10 million km from the Sun, which is over 20 times the radius of the Sun (and is roughly 0.1AU). 6.) For me, there seems to be no logical reason to distinguish between the (K-) Corona and the Solar Wind. Or stating it another way, there appears to be no way to locate the division between the two (which, as the article states, varies with local conditions). I'd guess for the experts that it depends on what instrument he or she is using at the time. (i.e. "What my instrument has collected data on is what I'm talking about when I use the term").75.90.39.77 (talk) 19:07, 13 August 2018 (UTC)

Move discussion in progress

There is a move discussion in progress on Talk:Corona (disambiguation) which affects this page. Please participate on that page and not in this talk page section. Thank you. —RMCD bot 21:17, 29 March 2020 (UTC)

Removal of misleading diagram

I have removed the diagram that was previously at the bottom of Stellar corona#Coronal loops (https://commons.wikimedia.org/wiki/File:Coronal_Hole_Magnetic_Field_Lines.svg). Because this is somewhat of a significant change, I'd like to give my reasoning behind it.

Assuming that the open field lines on the top and bottom of the half-circle represent the poles, the conventions used would imply that both poles are of the same magnetic polarity. This contradicts (correct) info given in solar magnetic field. Also, what is the orange beam coming out of the coronal hole? The coronal hole's relatively fast solar wind? Because it's positioned right on the equator it resembles pictures of the streamers of the equatorial slow solar wind during solar minimum! (See Solar wind's first image.) From my interpretation of the diagram, the two bipolar regions don't appear to follow Hale's law as well.

For these reasons, I have removed the diagram.

Strange preview on other page

On https://en.wikipedia.org/wiki/Sun in the characteristics box there is a link to "solar corona" (see temperature). The preview is weird: "Hello I am or Ayham or Jay". I can't fix it. Tazelaar (talk) 09:31, 4 March 2024 (UTC)

@Tazelaar: I got this too. It looks like the outdated lead from diff. It did not change for me after purging and also appears on other pages that link to Stellar corona. I have made a new edit to the page, and that appears to have fixed it. CoronalMassAffection 𝛿 ^talk_contribs 16:55, 4 March 2024 (UTC)

Languages links

There are a few links on this page to the equivalent pages in other languages. However, most links to on other languages wikis are on the Solar corona page. I don't know how to fix that. can someone help brink back all the links from the redirect page to this page? Wikidata doesn't want two pages to point to some other language's page. Alternatively, perhaps moving the article to Solar corona and making this page the redirect might be the answer. Dhrm77 (talk) 10:55, 10 April 2024 (UTC)