"Imaging Sunlight - Using a Digital Spectroheliograph"

I LOVE finding out about different ways to appreciate the Sun and light in general. Use this forum to post your info or questions about various outside the mainstream ways to appreciate our life giving star!
highfnum
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Re: "Imaging Sunlight - Using a Digital Spectroheliograph"

Post by highfnum » Fri Aug 05, 2016 7:29 pm

Spectral Joe
So you imply that 6 second scan better than 60 second scan which is better than 120 second scan?

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Spectral Joe
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Re: "Imaging Sunlight - Using a Digital Spectroheliograph"

Post by Spectral Joe » Fri Aug 05, 2016 9:59 pm

The quicker you can get the data the less likely something will go wrong, a moment of bad seeing, wind shaking the instrument (shouldn't happen if it's made properly, but..), a bird flying through, clouds, etc.
Observing the Sun with complex optical systems since 1966, and still haven't burned, melted or damaged anything.
Not blind yet, either!
Light pollution? I only observe the Sun, magnitude -26.74. Pollute that!

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Re: "Imaging Sunlight - Using a Digital Spectroheliograph"

Post by Merlin66 » Fri Aug 05, 2016 10:10 pm

As Joe says, the faster we can generate a spectroheliogram the better.
In the digital SHG it really comes down to the speed of the camera (fps) and the ability to store the amount of download data quickly.
The SHG I'm working on will use an ASI174 mono capable of up to 400 fps (when used on USB3 and SSD drive).
This then gives the potential of capturing a whole disk image in about 4 sec....ie 4 x 400 = 1600 pixel wide image.
Rather than use the mount slewing speeds I intend to incorporate a nodding mirror in front of the slit plate which can scan the disk in 4 sec.
"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
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Re: "Imaging Sunlight - Using a Digital Spectroheliograph"

Post by highfnum » Fri Aug 05, 2016 11:56 pm

Ok I got a faster camera
WillTry that

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Re: "Imaging Sunlight - Using a Digital Spectroheliograph"

Post by Wah » Mon Aug 22, 2016 9:41 am

My friends and I have bought totally 5 books, I got them yesterday! :band2 :band2 :band2
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Re: "Imaging Sunlight - Using a Digital Spectroheliograph"

Post by Merlin66 » Mon Aug 22, 2016 10:58 pm

Well done!
I hope you enjoy the content - feedback welcome.
"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

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