03Jun2014 PZ's SHG Images: He D3

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03Jun2014 PZ's SHG Images: He D3

Post by p_zetner »

A favourite wavelength: the He D3 Fraunhofer line. Lots of black plage evident.
I didn't "pretty up" this image as much in order to show the bright He D3 limb.
The comparison image is a He 1083nm image from the ChroTel telescope.

Cheers.
Peter.

He D3:
03Jun2014 HeD3.jpg
He 1083nm (ChroTel):
Chrotel_HeD3_03Jun2014_frame.jpg
Last edited by p_zetner on Thu Jun 05, 2014 11:06 pm, edited 1 time in total.


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Re: 03Jun2014 PZ's SHG Images: He D3

Post by marktownley »

Excellent! How narrow is this line?


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Re: 03Jun2014 PZ's SHG Images: He D3

Post by p_zetner »

Cheers, Mark.

The author of the reference below gives a so-called "1/e width" of 0.4 Angstroms for the measured (Gaussian) absorption line profile in plages.

If you look at figure 2 of the reference, this amounts to a 0.6 Angstrom fwhm.

Reference:

Title: A measurement of the helium D3 profile with a birefringent filter
Authors: Labonte, B. J.
Journal: Solar Physics, vol. 53, Aug. 1977, p. 369-374.

Peter.

BTW: Daystar makes He D3 line filters at the low price of $12000 for a 0.4A (fwhm) bandpass and $15500 for the 0.3A bandpass (QPE) versions!


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Re: 03Jun2014 PZ's SHG Images: He D3

Post by swisswalter »

Hi Peter

interesting that He D3 line


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Re: 03Jun2014 PZ's SHG Images: He D3

Post by DSobserver »

probably one day for me......

One question : how do you manage the setup of your grating?


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Re: 03Jun2014 PZ's SHG Images: He D3

Post by Montana »

:shock: wow! that is amazing!!!

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Re: 03Jun2014 PZ's SHG Images: He D3

Post by alex »

Very nice and very interesting Peter!

Do you know why we have the H3 limb is so brightening?


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Re: 03Jun2014 PZ's SHG Images: He D3

Post by Wah »

Let me help you to remove more horizontal bands :mrgreen:
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03Jun2014 HeD3.jpg
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Re: 03Jun2014 PZ's SHG Images: He D3

Post by p_zetner »

Thanks, Wah!

Did you use your technique of producing a flat from a crop and dividing?
I notice you use "divide" blending mode in Photoshop. I don't have this mode !?!
Trying it in ImageJ usually doesn't work well, so I use a horizontal lines suppression in ImageJ FFT bandpass filter.

Peter.


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Re: 03Jun2014 PZ's SHG Images: He D3

Post by Wah »

The Photoshop I use is version CS6, maybe you can try it.


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Re: 03Jun2014 PZ's SHG Images: He D3

Post by Cschur »

Ok Peter, Im impressed. I really like this line too! One day I would like to build a high res spectrograph that can take such images. For now, my spectrograph is 2A resolution with the 2400 grating, and between the 300 grating, and the two others I have Im working now on getting spectra of more solar system objects - mainly comets with my 12 inch. However, I do have just enough res you think to try some calcium drift scans? What would a 2A Cak drift scan look like? Can you take one for me so I can see if its worth it or do I have to build a new spectrograph?

Once again, your shots have always inspired me to look more deeply into the subject of spectrohelio graphs, and seems like I learn something every time I open Kens book!

Spectra of Comet ISON with spectrograph:
http://www.schursastrophotography.com/i ... F-1290.jpg


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Clear Creek Canyon Observatory, Happy Jack, Arizona
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Re: 03Jun2014 PZ's SHG Images: He D3

Post by highfnum »

Advanced stuff
but what does image
say?


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Re: 03Jun2014 PZ's SHG Images: He D3

Post by p_zetner »

Thanks, Chris.

With a 2400 /mm grating, you should be able to improve your resolution by a factor of 10, or more. Bandpass is dependent on line density of the grating, the slit size and the collimator focal length. The (reciprocal) dispersion (A per um or A per pixel) will depend on these factors and the camera lens focal length. The bandpass I get with such a grating is better than 0.2A, closer to 0.15A (25um slit, 500mmfl collimator lens). The reciprocal dispersion I get (270mmfl camera lens) is about 0.06A per pixel (4.5um px).

Here's a pic of CaK with a simulated bandpass of about 2A. It's pretty contrasty, but you will have more fun with a narrower bandpass.

Cheers.
Peter.
06Jun2014_CaK_2A-band.jpg


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Re: 03Jun2014 PZ's SHG Images: He D3

Post by Merlin66 »

Chris,
Narrower slit gap and longer focal length lenses is the way to get an improvement....check out the options with SimSpecV4.


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