The depth of the Sun's photosphere
- From: "Jeff Root" <jeff5@xxxxxxxxxxxx>
- Date: 28 Aug 2005 15:13:27 -0700
Joseph Lazio wrote in another thread:
> Stars are opaque. There isn't a single electromagnetic
> wavelength at which the Sun is optically thin. The depth
> to which we can see does vary by wavelength, but at all
> wavelengths the Sun (and other stars) is opaque.
For a couple of years I've had a web page on my to-do list
which would explain the meaning of the phrase "The surface
of the Sun". My target audience is about age 12 and up.
Calculating optical depths from first principles is not
something I'm going to attempt. Can you point me to any
graphs or tables showing mean free paths or optical depths
for various wavelengths of light in the Sun's photosphere?
The whole spectrum would be great, but just some extremes
would be useful. (Wavelengths of maximum transparency and
maximum opacity at whatever depths.) Also a density profile
of the photosphere. And I might as well ask if you know
of any special name for the "base" of the photosphere.
The somethingorotherpause?
Thank you!
-- Jeff, in Minneapolis
.
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