Dirk Van de moortel wrote:
"Jerry" wrote in message ups.com...

Dirk Van de moortel wrote:

"Jerry" wrote in message oups.com...

Dirk Van de moortel wrote:

"Jerry" wrote in message oups.com...

Henri Wilson wrote:


I take that to mean you have no evidence that IR comes
from the same layer as visible.

Henri,
1) How big does the Sun look in visible light?
2) How big does the Sun look in IR light?
3) How big does the Sun look in UV light?
4) How big does the Sun look at radio frequencies?

5) How big does the Sun look in X_rays?

Watch Henri invent another eponymous law to explain
why our observations of the Sun aren't relevant...

He will probably say something silly like for instance:
"I don't think we can judge the whole
universe by our local knowledge of it."

;-)
Dirk Vdm

If Henri had ANY knowledge of solar physics, he would have
caught you on X-rays. The photosphere is very dim in X-rays.
http://science.msfc.nasa.gov/ssl/pad/solar/corona.htm


Ah yes, since the photosphere is *much* cooler than the corona.
I should have thought of that one. For my defense, I can say
that my course on Stellar Internals and Atmospheres happened
27 years ago... pages and pages and pages covering one
single equation - horrible ;-)


He didn't correct you, which just goes to show how totally
ignorant he is.


Thanks for correcting me :-)

Cheers,
Dirk Vdm

I think this discussion started with my claim
that all the radiation comes from the photosphere.
This is obviously not strictly true.
What I meant (and also said, but didn't repeat every time)
is that all the black body radiation comes from the same
layer - the photosphere. This is rather obvious - the black
body radiation comes from the part of the star which is dense
enough to act as a "body" and emit a continuous spectrum.
Deeper layers are not transparent.
The 10um IR radiation is part of the black body radiation like
visible light is. But radio frequencies and X-rays are not.

Paul