There is a lot of info in here http://issuu.com/linkahwai/docs/solarobserver1
particularly from p47 onwards, but dotted about in various articles.
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How it works
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Re: How it works
Vanter, maybe you could post a link to the CN posts?
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Re: How it works
The etalon produces a series of very narrow bandwidth images (about 0.7A wide) spaced every 10A across the whole spectrum, from blue to far red. Like an optical "comb"
One of these images coincides with the wavelength of H alpha. The job of the blocking filter is to "block" all the other bandwidths and just allow the H alpha image to get through.
The D-ERF reduces the intensity of the UV-red region of the spectrum, but doesn't block the etalon "comb"
I have some spectroscope images of the various bandwidths for a couple of SM60 etalons and two samples of the Coronado blocking filters.
The bandwidth of the BF is around 5A centred on Ha.
I'll upload the images when I find them.
One of these images coincides with the wavelength of H alpha. The job of the blocking filter is to "block" all the other bandwidths and just allow the H alpha image to get through.
The D-ERF reduces the intensity of the UV-red region of the spectrum, but doesn't block the etalon "comb"
I have some spectroscope images of the various bandwidths for a couple of SM60 etalons and two samples of the Coronado blocking filters.
The bandwidth of the BF is around 5A centred on Ha.
I'll upload the images when I find them.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
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"Astronomical Spectroscopy for Amateurs" and
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https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer