Re: sun's spectrum

["Bob Sciamanda" <trebor@velocity.net>]

-----Original Message-----
From: Leigh Palmer <palmer@sfu.ca>
To: phys-l@atlantis.uwf.edu <phys-l@atlantis.uwf.edu>
Date: Friday, January 30, 1998 7:41 PM
Subject: Re: sun's spectrum
> . . .                              Emission lines are those for which
> the radiant flux is greater than the flux at adjacent wavelengths.
> they show as peaks in a spectrum of intensity plotted against
> wavelength. The Sun has none to speak of in the visible, and
> certainly not in the disk for hydrogen, which is abundant in the
> chromosphere. Emission lines of hydrogen can be seen in solar
> prominences during a total solar eclipse. In fact they look red.
> Those with an intense interest in the solar spectrum might like
> to store this URL:  http://mesola.obspm.fr/form_spectre.html
>
> Leigh
There is a project going on, involving several observatories, which is
mapping the rotation velocity of the sun's surface by carefully measuring
(and mapping) Doppler shifts in the H alpha line as a function of position
on the disk.  Our campus astronomer is involved;  I don't know all the
details, but I was given to understand that the procedure involved observing
the disk through an H alpha filter.  Does this jive with what you're saying,
Leigh?  Perhaps it is just that the H line is there but it does not stand
out in brightness against the continuum. (?)
-Bob

Bob Sciamanda   sciamanda@edinboro.edu
Dept of Physics   trebor@velocity.net
Edinboro Univ of PA  http://www.edinboro.edu/~sciamanda/home.html
Edinboro, PA   (814)838-7185

"All things . . .   linked are,
That thou canst not stir a flower,
Without troubling of a star."        -Francis Thompson