|
MikeBu
super member
Reged: 12/04/07
Posts: 122
|
Re: Using a Nightime H-Alpha filter for Solar view
04/25/08 02:32 PM
|
|
|
This site has good data on the solar spectrum, with resolution to 0.002 Angstroms in the region of H-alpha. The data is given as a spectral density, total power in a bandwidth is easy to calculate by numerical integration of the data.
http://bass2000.obspm.fr/solar_spect.php?step=1
This data shows the absorbtion line for H-alpha has a spectral density of about 16.04% the density of the local maximum, the local maximum is approx. the black body emission according to Plank's Law. So the intensity dips a little less than an order of magnitude. For the Calcium lines the dip was deeper, somewhere between 4-5% if I remember correctly.
When you say the dip isn't deep enough, I think the data is showing the H-alpha emission spectrum of the excited hydrogen in the chronosphere in conjunction with the emission dip from absorbtion and not just the absorbtion. The photosphere emission is blocked to a much greater degree and then scattered with the result in the data being that portion of the energy scattered in our direction.
Edited by MikeBu (04/25/08 02:44 PM)
|
|
2 registered and 5 anonymous users are browsing this forum.
Moderator: Don W, spaceydee
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Rating:
Thread views: 7639
|
|
|
|
|
|
|
Previous
Index
Next
Flat
Edit
Reply
Quote
