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caH caK and aluminum

Posted: Sun Aug 09, 2015 5:57 pm
by highfnum
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 5151 times

Re: caH caK and aluminum

Posted: Sun Aug 09, 2015 5:57 pm
by highfnum
caK
fc2_save_2015-08-09-104535-0000ca_00caky.JPG
fc2_save_2015-08-09-104535-0000ca_00caky.JPG (164.29 KiB) Viewed 5150 times

Re: caH caK and aluminum

Posted: Sun Aug 09, 2015 5:58 pm
by highfnum
caH
fc2_save_2015-08-09-104535-0000ca_cahy.JPG
fc2_save_2015-08-09-104535-0000ca_cahy.JPG (151.16 KiB) Viewed 5150 times

Re: caH caK and aluminum

Posted: Sun Aug 09, 2015 6:05 pm
by highfnum
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 5149 times

Re: caH caK and aluminum

Posted: Sun Aug 09, 2015 6:40 pm
by marktownley
These are excellent!

Re: caH caK and aluminum

Posted: Sun Aug 09, 2015 8:46 pm
by highfnum
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
alumclosin.JPG (169.47 KiB) Viewed 5125 times

Re: caH caK and aluminum

Posted: Mon Aug 10, 2015 8:16 am
by Derek Klepp
Keep at it.Its great to see all the different Wavelengths

Re: caH caK and aluminum

Posted: Mon Aug 10, 2015 9:32 am
by Montana
Wow! the last image is very interesting indeed, I wonder what features these are :bow :bow :hamster:

Alexandra

Re: caH caK and aluminum

Posted: Mon Aug 10, 2015 4:16 pm
by p_zetner
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.
Peter.

Re: caH caK and aluminum

Posted: Mon Aug 10, 2015 4:29 pm
by p_zetner
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 5086 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.

Re: caH caK and aluminum

Posted: Mon Aug 10, 2015 9:39 pm
by highfnum
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
cakcahlines.jpg (34.22 KiB) Viewed 5071 times

Re: caH caK and aluminum

Posted: Mon Aug 10, 2015 10:40 pm
by highfnum
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

Re: caH caK and aluminum

Posted: Tue Aug 11, 2015 9:43 am
by Montana
Which is the aluminium line on the photo?

Alexandra

Re: caH caK and aluminum

Posted: Tue Aug 11, 2015 10:21 am
by DSobserver
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

Re: caH caK and aluminum

Posted: Tue Aug 11, 2015 8:42 pm
by highfnum
"Which is the aluminium line on the photo?"

in between caH and caK
the more pronounced lines

Re: caH caK and aluminum

Posted: Tue Aug 11, 2015 10:18 pm
by Merlin66
Here's a BASS2000 profile showing the CaH and Al line at 3561.5A
Al_caH chart.jpeg
Al_caH chart.jpeg (70.31 KiB) Viewed 5015 times

Re: caH caK and aluminum

Posted: Wed Aug 12, 2015 12:14 am
by Merlin66
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.