03Jun2014 PZ's SHG Images: CaII K3, CaII K1v

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
User avatar
p_zetner
Almost There...
Almost There...
Posts: 834
Joined: Sun Mar 18, 2012 4:59 pm

03Jun2014 PZ's SHG Images: CaII K3, CaII K1v

Post by p_zetner » Thu Jun 05, 2014 4:02 pm

Hello Everyone.

Here are 2 SHG images taken in the CaII K absorption line.
(The reason I'm writing CaII is not to confuse with upcoming images in the CaI (neutral) line.)

CaII K3:
03Jun2014 CaK3.jpg
CaII K1v:
03Jun2014 CaK1v.jpg
A little less contrast in the K1v line, but still some evidence of the huge filament near the E limb. Sunspots are a little less visible in K3 since we are looking high in the chromosphere.


SHG observation of CaK is tremendously interesting! Watching plage and other features as they appear, real time, in the spectrum video is fascinating.
For me, the imaging results are also far more gratifying than H alpha, at least at the dispersion and bandpass I'm currently using. (I think I might be guilty of over-processing my H alpha images!)

For my imaging program, I'll settle on alternating between two configurations of the SHG. I'm going to replace my 2400 /mm grating with a 3600 /mm for better dispersion in the CaK region. The drawback: the 3600 /mm grating has a long wavelength limit of about 5300A. This will be my short wavelength device. For longer wavelengths, I will go back to my tandem grating design (79 /mm echelle and 1800 /mm grating) which gives me super high dispersion and works better at longer wavelengths. It's pretty straightforward to change configurations between imaging sessions.

Cheers.
Peter.

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: 03Jun2014 PZ's SHG Images: CaII K3, CaII K1v

Post by swisswalter » Thu Jun 05, 2014 4:29 pm

Hi Peter

wonderful results. Do you change only the grating and the switch is done ?
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 ;)

alex
Im an EXPERT!
Im an EXPERT!
Posts: 235
Joined: Sat Nov 05, 2011 4:39 pm
Location: Poland

Re: 03Jun2014 PZ's SHG Images: CaII K3, CaII K1v

Post by alex » Thu Jun 05, 2014 6:58 pm

Great results Peter!
I am interested to see how you move on!

User avatar
p_zetner
Almost There...
Almost There...
Posts: 834
Joined: Sun Mar 18, 2012 4:59 pm

Re: 03Jun2014 PZ's SHG Images: CaII K3, CaII K1v

Post by p_zetner » Thu Jun 05, 2014 7:17 pm

Thanks Alex and Walter.

Walter: Here is a schematic of the spectrometer portion of the SHG.
SHG schematic 1.jpg
SHG schematic 1.jpg (85.52 KiB) Viewed 797 times
Elements #1 and #2 are easily changed to configure as I'd like.

For medium dispersion in the green to violet, #1 is a 40mm sq mirror with element #2 the 3600 /mm, UV blazed grating.

For high dispersion, I've used a 79 /mm echelle as element #1 and 1800 /mm grating as #2. This gave me a silly (reciprocal) dispersion of about 0.007A per px and a bandpass of about 0.07A ! I didn't proceed with this config for imaging because I had vicious vignetting at the time (bad exit pupil problem - now cured!). I think a more reasonable configuration (for ease in tuning) might be grating as element #1 and echelle as element #2. I have yet to try it.

Cheers.
Peter.

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: 03Jun2014 PZ's SHG Images: CaII K3, CaII K1v

Post by swisswalter » Thu Jun 05, 2014 7:27 pm

Hi Peter

thank you very. so it is not as simple as that ;)
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
marktownley
Librarian
Librarian
Posts: 24117
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: 03Jun2014 PZ's SHG Images: CaII K3, CaII K1v

Post by marktownley » Thu Jun 05, 2014 9:49 pm

Cool pickies Peter!
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!

User avatar
Montana
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 19478
Joined: Mon Oct 17, 2011 5:25 pm
Location: Cheshire, UK

Re: 03Jun2014 PZ's SHG Images: CaII K3, CaII K1v

Post by Montana » Fri Jun 06, 2014 12:05 pm

Wonderful images, I love the long filament :bow :bow :bow

Alexandra

Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests