question to SHG owners

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highfnum
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question to SHG owners

Post by highfnum » Tue Sep 15, 2015 11:14 pm

still doing my research on old time solar research
I found photo of sun taken at 6374 Fe nine times ionized
in Harvard books on astronomy telescope accesories 1945 page 213

has any one tried this line?

like one I tried - Al line that I found in old W Semerau article

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Merlin66
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Re: question to SHG owners

Post by Merlin66 » Wed Sep 16, 2015 4:51 am

JP,
If you re-read that section (p210-215) you'll see that they are referring to the Coronagraph developed by Lyot. I think the highly ionised Fe is only associated with the corona and not visible in the chromosphere.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

highfnum
Way More Fun to Share It!!
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Re: question to SHG owners

Post by highfnum » Wed Sep 16, 2015 8:48 am

Ok and correct

but I did notice a lot of proms in image
figured you may get prom and empty disk
similar to a shot Wah took a while back in helium D3

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