Discussion on the universe split to new thread.
Posted By: Gaspode
Or it will detect 192/5A light from reflections off of solid material at a lower temperature. Like the mirror in TRACE'S telescope.![]()
That mirror is no where near 1 million degrees. Same with the solar surface.
Basic physics.
So if the surface did exist then there is no problem with the reflection part.
We will get to the thermodynamic considerations.
It is your contention using your photosphere model that not enough energy escapes to allow a solid iron surface to exist under "your photosphere model".
And I'm sure your model requires complete coverage of the lower surface to achieve your goals(molten iron/plasma).
It is my contention that enough energy escapes from under the surface glow to allow a solid surface to exist in my surface glow model.
Your assumption is that the photosphere is the only surface that is emitting energy.
And there are various energy release mechanisms to prevent the iron surface from heating up..
Sun spots(holes), CME, coronal loops, IR from the solid surface below the glow, Solar wind, polar plumes, and not all of the visible comes from the photosphere. And neither does the UV which is the most energetic and variable part of the solar spectrum.
So we are on the same page at last: Any light can reflect off a reflective surface.
The problem is that the Sun is too hot for any such surface to exist.
I have no "contention".
The facts are that
Thus the Sun is too hot for any solid surface to exist.
- There is overwhelming evidence that Sun is internally heated through fusion. The observed neutrinos types are a fingerprint of fusion. The observed neutrino flux matches enough fusion to produce the energy output of the Sun.
This means that the temperature of the photosphere is the minimum temperature of the Sun before light escapes from it. This is simple thermodynamics - the closer you get to a source of heat the hotter you get.- The photosphere is at a temperature of ~6000 K. The temperature increases with depth to ~9400 K at a depth of a few hundred kilometers. This supports pont 1.
So that finishes the thermodynamic considerations.
Well, now, let's talk about basic physics and see if there really is "no problem".
First, what about "just like the mirror in TRACE'S telescope". The mirrors in TRACE, like any other astronomical mirror, are highly polished to enhance reflectivity. Is the "surface" of the sun (whatever it might be made of) highly polished? Unlikely, I think. And in the case of TRACE, the primary mirror is coated with special, normal incidence coatings that further enhance reflectivity at UV & EUV wavelengths, and to narrow the passband. Are there any reflectivity enhancing coatings on the surface of the sun? I think that too is unlikely.
Next, let's ask what this reflective surface is made of. In keeping with the primary consideration of this thread, let's just assume the surface is iron (or at least mostly iron). I don't know how iron reflects EUV wavelengths, but in a moment I will guess. Meanwhile, I do know that iron reflects visible light about 62% at the red end (7000Å) down to 52% at the blue end (4000Å). If we simply assume a linear trend to shorter wavelengths, we would get about 35% reflectivity around 192Å or 195Å. But that does assume a specular surface and we know that dispersion off of a non-specular surface will degrade the reflectivity, so 35% would be a best-case scenario guess.
But here comes that basic physics. Photons that ionize iron don't reflect off of an iron surface, they ionize it and disappear in the process. Likewise, photons that carry enough energy to melt iron don't reflect off of an iron surface, they melt it and disappear in the process. The 192/5Å passband represents Fe XII (11-times ionized iron). So we would expect photons at that wavelength to preferentially not reflect off of an iron surface, but rather to ionize it. Furthermore, the 192/5Å passband represents the peak of thermal emission in the broad range of temperatures 500,000 - 2,000,000 Kelvins. Since the melting point of iron is 1811 Kelvins, and its boiling point is 3134 Kelvins, we would expect photons in the 192/5Å passband to melt & vaporize the iron surface and disappear in the process, and not to reflect off of the surface.
So, why does the mirror on TRACE not melt in the face of melting photons in the 192/5Å passband? It's all about intensity. The TRACE mirror has to deal with a few photons. One at a time, we don't necessarily expect the photons to ionize or melt anything (although the coatings are intended in part to prevent degradation of the primary mirror). But when photons gang up on a surface, they can and will provide enough thermal energy to melt & vaporize that surface, and then ionize the resulting vapor. Here at Earth, where we find TRACE, the incident solar EUV flux will be about 2 erg cm-2 sec-1, whereas at the sun we are looking at roughly 600,000 erg cm-2 sec-1 (which will be much higher near active regions). And do note this is EUV flux only, the bolometric flux at the photosphere is about 60,000,000,000 erg cm-2 sec-1. That's a lot of photons, and we cannot simply pretend that any solid surface is immune to the effect of that kind of photon bath.
So basic physics presents a problem after all. No, TRACE should not see any photons in the 192/5Å passband reflecting off of any iron surface. Rather, all of those photons should disappear in the process of melting, vaporizing and ionizing that surface. Furthermore, a little consideration shows that this should be the case no matter what the surface is made out of, since the temperature range 500,000 - 2,000,000 Kelvins vastly exceeds the boiling point of all known materials. So photons of the 192/5Å passband should not reflect off of any surface on the sun, regardless of its chemical/physical makeup.
The evidence for fusion is that fusion has a specific signature, i.e. gives off certain neutrinos. These neutrinos are detected in the types and amount that show that the sun is powered by fusion.The only "evidence" you have for fusion is supposedly neutrinos that change in certain ways(that you cant really see) on the way to the earth.
The only problem is with your model of the sun is that it is physically impossible as has been pointed out many times before. That makes any assertions you make about it moot. You should read the posts:As far as your claim for a thermodynamically impossible(my model) model.
Your model has more problems than mine.
Yours is also heated from both sides enough to meltYou have a cool layer that is heated from BOTH SIDES.
Mine is only heated from one side.
If you want to invoke some mechanism for heat transfer, then you can apply that same mechanism to my model.
I never said the surface was immune to that flux of photons. But that doesnt mean the surface is not visible at those wavelengths. And its probably sputtering off great amounts of iron. But we know how much from the heavy atoms in the solar wind.
As far as your claim for a thermodynamically impossible(my model) model.
Your model has more problems than mine.
You have a cool layer that is heated from BOTH SIDES.
Mine is only heated from one side.
If you want to invoke some mechanism for heat transfer, then you can apply that same mechanism to my model.
The surface is not visible because the surface does not exist. That fact has been explained dozens, maybe hundreds of times in this thread alone, and is irrefutably supported by several very well developed branches of astrophysical and related sciences including thermodynamics, general relativity, and helioseismology. Your continued arguments from incredulity and ignorance do not support your claim.
No. I don't think that any of these news reports address the fact that your idea is physically impossible according to quite basic physics as pointed out to you in many posts.No. I dont think so.
For instance lets do a little media surfing
...various news reports...
You do not have a "model" - that suggests that you can produce numeric predictions like the scientific solar model.That means that calculated opacities will be off. That means photospheric opacities may be wrong. Or that my model is more likely to be right.
The author is distinguished but has no formal background in astronomy: "Pierre-Marie L. Robitaille, Ph.D. is currently a Professor of Radiology at The Ohio State University in Columbus, Ohio.".From a paper that I dont necessarily agree with the conclusions but he has some interesting things to say.
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http://thermalphysics.org/Sun.evidence.1.pdf
Hi Brantc!
http://thermalphysics.org/Sun.evidence.1.pdf
Really? he claims to have disporoved the universality of black body radiation, in a paper that references his papre that references another paper, one of which was published.
Um sure whatever.
No, it isn't. The corona is a higher temperature, but it's also transparent, which means that it doesn't stop outgoing radiation and provides very little ingoing radiation. The photosphere radiatively couples to deep space, not the corona. But anything under the photosphere cannot radiatively couple to deep space, but only to the photosphere. Again, basic thermodynamics fail.
No, brantc. Your model is heated from ALL sides.
Obviously not, since the corona is transparent but the 5700K photosphere is not. Thanks for demonstrating that you haven't learned a thing.
Not really. The thermosphere mass density, in the high temperature regions you are talking about, ranges between 10-8 and 10-9 gm/cm3, whereas the mass density of the solar photosphere, at optical depth 1 and temperature 6520 Kelvins, is about 3x10-7 gm/cm3, 30 to 300 times the mass density of the thermosphere. The solar photosphere does not get that tenuous until about 400 km above the optical depth 1 layer, where its mass density reaches about 10-8 gm/cm3 and its temperature falls to about 4600 Kelvins (it falls to a local minimum of about 4400 Kelvins at 500 km and then increases again to over 6000 Kelvins at the top, where the mass density is a meager 10-11 gm/cm3). So you are off by at least an order of magnitude there.Don't you get this yet?????? The photosphere on the sun is of lower density than the thermosphere ......
That does not really make any physical sense. Anything that is in thermal equilibrium, whether thin or thick, will not trap any of the out going radiation, not even 1%, let alone 100%. It will absorb energy on one side, and emit the same amount of energy on the other side, minus the energy needed to maintain its kinetic temperature. Now, I suspect what you think you are saying (in which case you should actually say it instead of something else), is that the photosphere is transparent at some wavelength. That's an easy assertion to make, but not to prove. If you think it is, all you have to do is specify the constituent gases, their density & temperature, and compute the opacity/transparency at a given wavelength. The trick is that if your model photosphere is not consistent with observations, then nobody will believe you, and for good reason.As far as the photosphere goes its so thin that its thermodynamically impossible for that layer to trap 100% of all out going radiation.
Non-sequitor. What does being visible in white light, or any other light, have to do with "through the photosphere"? how do you know that that the bright patches do not originate where they appear to originate, namely above the photosphere, where they appear in the images?Since the loop foot prints are visible in white light then you can see through the photosphere which is just a layer of plasma about 200 to 400km thick.
First, get the temperatures right. Zero Celsius is +273.5 Kelvin (let's call it 273 for simplicity), so 1500 - 2500 Celsius from the Wikipedia page is 1227 - 2227 Kelvins, a difference of 11% at the high end, which is significant.The thermosphere is 1500K- 2500K how come the earth doesnt overheat???????
A true blackbody spectrum comes only from a solid body. That box in kirchoffs experiment will never be thermally equilibrated.
Plasma only emits lines. Water is not a blackbody as the emission changes with the nadir angle.
Thats his basic argument.
And its true.
Thats why the solar spectrum is the result of a solid body + arc overlayed with plasma.
Sure. With your model of the photosphere. But we are not talking about that are we.
Since the loop foot prints are visible in white light then you can see through the photosphere which is just a layer of plasma about 200 to 400km thick.
Not your surface of last scattering after photons have traveled ten bizillion years randomly to the surface. And then the have emerged with exactly the right spectrum to simulate a perfect blackbody.
LOL.... Its a decreasing density plasma ball with a "convection" and some other kind of layer. And like thats not going to show up in the spectrum....![]()
As far as the photosphere goes its so thin that its thermodynamically impossible for that layer to trap 100% of all out going radiation.
Its so thin that its total heat emission is lower than the total heat emission from the solid surface below.
Here let me say that again.
Its so thin that its total heat emission is lower than the total heat emission from the solid surface below.
RC...
The thermosphere is 1500K- 2500K how come the earth doesnt overheat???????
The photosphere is also of lower density than:Dont you get this yet?????? The photosphere on the sun is of lower density than the thermosphere......
Fairly standard physics:The thermosphere is the biggest of all the layers of the earth's atmosphere directly above the mesosphere and directly below the exosphere. Within this layer, ultraviolet radiation causes ionization.
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The highly diluted gas in this layer can reach 2,500 °C (4,530 °F) during the day. Even though the temperature is so high, one would not feel warm in the thermosphere, because it is so near vacuum that there is not enough contact with the few atoms of gas to transfer much heat. A normal thermometer would read significantly below 0 °C (32 °F), due to the energy lost by thermal radiation overtaking the energy acquired from the atmospheric gas by direct contact.
And if you ignore what has been said before about the emission of free electrons, then it makes you look like you don't really know much about plasma or physics.
Seriously Brantc, you got served on this issue before.
Apparently you are talking about a model which isn't based in physical reality.
You can't see through the photosphere.
The photosphere is, by definition, the region in the Sun's atmosphere where the plasma goes from being transparent to being opaque. You can't see through the photosphere.
I am not changing your definition of the word.Here, let me say that again. The photosphere is defined as the region where the solar atmosphere transitions from being transparent to being opaque. You cannot see through it. Nobody can. Is there some particular reason you insist on trying to change the perfectly good, valid, legitimately scientific definition of the word?
The internal fusion model is dead.You're continuing to try to describe a fantasy Sun, one whose existence has been demonstrated time and again to be impossible. There are several very highly developed branches of physics which show, to the satisfaction of every professional solar physicist on Earth, that your claim is false, your incessant arguments from incredulity and ignorance notwithstanding.
You can't see through the photosphere.