Talk:Hydrogen-alpha

Colour of this Line?

It may not be very scientific, but could we get an image block filled with the actual colour (or the closest rgb equivalent?) 70.66.73.48 07:05, 13 December 2006 (UTC)

since your eyes are not capable of seeing this wavelength it would be redundant to show it, cause whatever you would see would just be a replacement, you could even replace it with blue or pink to make it visible for your eye. Maybe you can think of it as an X-Ray-foto, what you see there is black and white, although X-Rays don't have any visible color at all.--131.220.96.186 14:33, 13 August 2007 (UTC)

actually, 656 nm is perfectly visible to most humans (as the article already implies), but it's a long enough wavelength that the RGB equivalent is just pure red. Converting a particular wavelength into RGB is such an approximation that I'm not sure that it's useful here. 128.220.233.155 (talk) 18:38, 6 December 2007 (UTC)

Energy of this line?

I would be interested to know what quantity of energy or temperature this line relates to, and possibly how to calculate it or where to look it up. Hansschulze (talk) 08:25, 7 February 2008 (UTC)

Use Planck's Formula (E=hf) and substitute for f (f=c/λ) and work out the photon energy from there. Coatesg (talk) 15:18, 15 February 2008 (UTC)

Filter details -citations

I've added corrections and details about H-alpha filters. I know what I have done is correct because I have got one.

However, I am having difficulty in finding decent citations because there is not much information out there except a few commercial sites.

Does anyone have any thoughts or information? Man with two legs (talk) 20:04, 2 March 2014 (UTC)

Professional observatories use Lyot filters. There is an Existing Wikipedia page, with references, on this topic. Big Bear Solar observatory notes the use of Lyot filter on their website (http://www.bbso.njit.edu/Research/FDHA/) These filters tend to be very expensive one-off items. PaulD821 (talk) 23:46, 21 September 2016 (UTC)