caH caK and aluminum

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highfnum
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caH caK and aluminum

Post by highfnum » Sun Aug 09, 2015 5:57 pm

aluminum my favorite of the day
interesting in what has strong signal
fc2_save_2015-08-09-104535-0000ca_002alum.JPG
fc2_save_2015-08-09-104535-0000ca_002alum.JPG (147.64 KiB) Viewed 1681 times
Last edited by highfnum on Sun Aug 09, 2015 6:26 pm, edited 1 time in total.

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Re: caH caK and aluminum

Post by highfnum » Sun Aug 09, 2015 5:57 pm

caK
fc2_save_2015-08-09-104535-0000ca_00caky.JPG
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Re: caH caK and aluminum

Post by highfnum » Sun Aug 09, 2015 5:58 pm

caH
fc2_save_2015-08-09-104535-0000ca_cahy.JPG
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Re: caH caK and aluminum

Post by highfnum » Sun Aug 09, 2015 6:05 pm

did a swap of camera lens part with
200mm replaced with 300mm
you get closer but centering gets harder to do
and easy to clip sun
fc2_save_2015-08-09-104831-0000ca300mm.JPG
fc2_save_2015-08-09-104831-0000ca300mm.JPG (181.29 KiB) Viewed 1679 times

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Re: caH caK and aluminum

Post by marktownley » Sun Aug 09, 2015 6:40 pm

These are excellent!
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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Re: caH caK and aluminum

Post by highfnum » Sun Aug 09, 2015 8:46 pm

thx
here is close in of aluminum
I think this is real cool never saw this before
cleanest SHG shot for me so far
alumclosin.JPG
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Re: caH caK and aluminum

Post by Derek Klepp » Mon Aug 10, 2015 8:16 am

Keep at it.Its great to see all the different Wavelengths

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Re: caH caK and aluminum

Post by Montana » Mon Aug 10, 2015 9:32 am

Wow! the last image is very interesting indeed, I wonder what features these are :bow :bow :hamster:

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Re: caH caK and aluminum

Post by p_zetner » Mon Aug 10, 2015 4:16 pm

Your SHG work is really coming along nicely!

As far as the Al line goes, my guess is that you're mostly observing the blue wing of CaH. The 396.15nm Al line is quite narrow inside the much wider CaH absorption feature. (Here's a spectrum I took earlier: http://www.pbase.com/p_zetner/image/157097805, also here on SolarChat somewhere. ). Unless your spectral bandpass is very narrow, you're seeing a lot of the spectral region outside of the Al line. From your images, I guess your bandpass is around 0.03nm, not narrow enough to isolate Al.

I'm curious about your close-up. How did you achieve it? What change in optics did it involve?

Cheers.
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Re: caH caK and aluminum

Post by p_zetner » Mon Aug 10, 2015 4:29 pm

On second thought (!), maybe you are observing predominantly Al.

Here is a portion of the BASS2000 spectrum around CaH.
BASS2000 CaH region.png
BASS2000 CaH region.png (54.06 KiB) Viewed 1616 times
The Al line is very deep and about 0.04nm wide (fwhm). Generally the stronger the absorption, the higher up in the solar atmosphere you're observing (as long as you're looking in the "core" of the line). With 0.03nm instrumental bandwidth you'd be seeing significant Al absorption and (likely) some chromospheric features, although the sunspots are very dark and visible indicating mostly photosphere in your image.

Cheers.
Peter.

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Re: caH caK and aluminum

Post by highfnum » Mon Aug 10, 2015 9:39 pm

zoom image combo of longer fl scope and using zoom SW feature

teach me!
this is example of ca area
Al looks separate enough to me
but Im not expert !
you may be correct
here is a typical caK cah and al line area
cakcahlines.jpg
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Re: caH caK and aluminum

Post by highfnum » Mon Aug 10, 2015 10:40 pm

the question is how did i pick the Al line?
being a novice I read following
from "the amateur scientist" C.L.Strong
a guy named Walter Semerau built spectroheliograph
he pointed out AL lines in some photos in text

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Re: caH caK and aluminum

Post by Montana » Tue Aug 11, 2015 9:43 am

Which is the aluminium line on the photo?

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Re: caH caK and aluminum

Post by DSobserver » Tue Aug 11, 2015 10:21 am

hello

if you don't mind, as an advice, I would suggest you first to improve more your focus before to go for some more exotic lines....

Start with Ha (the easiest for focus), then Cak (harder 'cause shorter wavelenght), and only after for exotic ones

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Re: caH caK and aluminum

Post by highfnum » Tue Aug 11, 2015 8:42 pm

"Which is the aluminium line on the photo?"

in between caH and caK
the more pronounced lines

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Re: caH caK and aluminum

Post by Merlin66 » Tue Aug 11, 2015 10:18 pm

Here's a BASS2000 profile showing the CaH and Al line at 3561.5A
Al_caH chart.jpeg
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"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
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"Astronomical Spectroscopy for Amateurs" and
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Re: caH caK and aluminum

Post by Merlin66 » Wed Aug 12, 2015 12:14 am

Semerau was active in the 1950/1960's and published many articles in S&T.
The first in May 1958 and an interesting report on solar imaging in July 1968.
Last edited by Merlin66 on Wed Aug 12, 2015 12:18 am, edited 1 time in total.
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"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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