Spectroheliograph: Images and Spectra

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p_zetner
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Spectroheliograph: Images and Spectra

Post by p_zetner »

Hello Everyone.

More spectroheliograph stuff!

First some spectra near H-alpha and CaK.

H-alpha Spectrum:


CaK Spectrum:


Comparison is made with the BASS2000 solar spectra. Agreement is generally pretty good with some discrepancies - like additional observed lines!

Here is an image (not great) taken at H alpha line centre.
H alpha image
Lots of room for improvement here!

I re-configured my Aug 25 CaK images for display as a collage:
CaK Spectral Series
CaK Spectral Series (Full Size)

Once again, you can clearly see a filament present in frames 5 - 7 (South region).

Each frame represents an image constructed from a 1px spectral slice taken in the spectral location identified in the following graph.


Here is a spectrum showing the difference between CaK absorption in the presence and absence of plage:

The classic bright peaks in K2r and K2v are visible!

Quite a few things left to do to improve image quality. For one thing, I haven't completely eliminated the problem of the curvature of the spectral lines. Consequently, feature contrast in the polar regions is always worse than in the equatorial regions of the image. I've used the General Quadrilateral Transform filter in VirtualDub but some of the problem persists and is a killer in H alpha where the line is relatively narrow (compared to CaK). I'm continuing to work on it!

Cheers.
Peter.


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Re: Spectroheliograph: Images and Spectra

Post by marktownley »

I'm liking this Peter, it helps me develop my understanding with CaK as to how it all works and then can use the information to tweak my own approaches to both filter and equipment design, and then also processing. Thank you :)


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: Spectroheliograph: Images and Spectra

Post by swisswalter »

Hi Peter

thank you for that interesting stuf


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 :)

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Re: Spectroheliograph: Images and Spectra

Post by Montana »

Absolutely stunning work :bow: :bow: :bow: this is fabulous information when we have so little info about the CaK region. Many thanks and great work :)

Alexandra


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Re: Spectroheliograph: Images and Spectra

Post by alex »



Quite a few things left to do to improve image quality. For one thing, I haven't completely eliminated the problem of the curvature of the spectral lines. Consequently, feature contrast in the polar regions is always worse than in the equatorial regions of the image. I've used the General Quadrilateral Transform filter in VirtualDub but some of the problem persists and is a killer in H alpha where the line is relatively narrow (compared to CaK). I'm continuing to work on it!

Cheers.
Peter.

Hello!
Really nice work!
Can you please show us an image of the problem?

Greetings from Poland
Alex


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Re: Spectroheliograph: Images and Spectra

Post by Carbon60 »

Great work Peter.

Very interesting data.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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