Who has experience looking into a spectrohelioscope?

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!
Post Reply
Wah
Im an EXPERT!
Im an EXPERT!
Posts: 339
Joined: Tue May 01, 2012 2:14 am

Who has experience looking into a spectrohelioscope?

Post by Wah » Mon Feb 02, 2015 6:52 am

I wonder how would it be if looking into a spectrohelioscope?
Is there anyone here having such experience?

It is difficult / nearly impossible to take images though SHS because of the difficulty of synchronizing the exposure time and frame rate with it? :roll: :roll: :roll: :roll:

User avatar
swisswalter
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 17951
Joined: Thu Feb 06, 2014 4:28 am
Location: Switzerland
Contact:

Re: Who has experience looking into a spectrohelioscope?

Post by swisswalter » Mon Feb 02, 2015 8:03 pm

Hi Wah

I'm so sorry, no idea at all
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

User avatar
Merlin66
Librarian
Librarian
Posts: 3167
Joined: Tue Dec 13, 2011 1:23 pm
Location: St Leonards, Australia
Contact:

Re: Who has experience looking into a spectrohelioscope?

Post by Merlin66 » Mon Feb 02, 2015 8:45 pm

Wah,
I think Joe Bartolik is the guy to answer your question.
I believe he uses a CCD linear array instead of the second slit.
"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

User avatar
Spectral Joe
Ohhhhhh My!
Ohhhhhh My!
Posts: 118
Joined: Wed Mar 14, 2012 4:34 am
Location: Livermore, California

Re: Who has experience looking into a spectrohelioscope?

Post by Spectral Joe » Tue Feb 03, 2015 12:36 am

Yes, as Ken says I currently use a linear CCD for readout, but in times past I tried a webcam synchronized to the scan of a spectrohelioscope. It was just an experiment to see how well it worked, potentially for visual demonstrations. Synchronizing the scan to the camera was not a problem for me, as I do this sort of thing all the time. If you are not used to doing this sort of thing it can be frustrating. There are both electronic and mechanical parts involved. My current instrument does a slow (6 second) scan with a moving mirror as the linear CCD is read out. The first time I tried this was with a Reticon chip in 1985, and have had good success with a number of versions. Oh, the webcam / spectrohelioscope experiment worked fine, I just concentrated my efforts elsewhere.
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!

Wah
Im an EXPERT!
Im an EXPERT!
Posts: 339
Joined: Tue May 01, 2012 2:14 am

Re: Who has experience looking into a spectrohelioscope?

Post by Wah » Tue Feb 03, 2015 1:53 am

How about the visual experience?
What can you see through the scope and how do you feel? :roll: :roll: :roll:

User avatar
Spectral Joe
Ohhhhhh My!
Ohhhhhh My!
Posts: 118
Joined: Wed Mar 14, 2012 4:34 am
Location: Livermore, California

Re: Who has experience looking into a spectrohelioscope?

Post by Spectral Joe » Tue Feb 03, 2015 2:44 am

I haven't done any visual observing with a spectrohelioscope in quite some time. It was exciting the first time, but I quickly moved onto photographic, and later, digital recording. One comment that sticks with me concerns the view through a spectrohelioscope versus that through a polarizing monochromator (Lyot filter), attributed to John W. Evans. Supposedly he said "the view through a polarizing monochromator can make a spectrohelioscope observer feel that their life had been wasted". The modern analog to the polarizing monchromator of those days is the etalon filtered telescope of today. I always felt that I could do better than the dim, flickering image of the spectrohelioscope. Building one, and getting it to work, is a fun and interesting project, especially getting it to work well. I have seen many begun, but most are never finished as it is a big job, and many people are disappointed with the view once they get it to work, especially if they have already seen the view through an etalon scope.
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!

Wah
Im an EXPERT!
Im an EXPERT!
Posts: 339
Joined: Tue May 01, 2012 2:14 am

Re: Who has experience looking into a spectrohelioscope?

Post by Wah » Tue Feb 03, 2015 4:10 am

But I think except Halpha images, most of people don't have any chances to see other band images.
I guess watching Hbeta or even Hgamma, He-D3 solar disk would be interesting!
With limited of $$$$$$, SHS should be the only choice.

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest