My Favorite:
http://www.prairieastronomyclub.org/halpha/
Hydrogen alpha features
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Re: Hydrogen alpha features
http://www.charliebates.org has a left side menu with an explanation of all three wavelengths and a student guide for different grade levels.
(shameless self promotion)
(shameless self promotion)
Stephen W. Ramsden
Atlanta, GA USA
Founder/Director Charlie Bates Solar Astronomy Project
http://www.solarastronomy.org
Atlanta, GA USA
Founder/Director Charlie Bates Solar Astronomy Project
http://www.solarastronomy.org