Hi Everyone.
A rather late post of some spectroheliograms taken on July 28. My processing is quite slow, some of it reliant on my computer programming skills which are a little rudimentary! I could still polish up some of the image details but will save that for full disk views that I am working on. The AR is shown in four wavelengths, three different chromospheres. The sunspot itself is not particularly visible in H alpha or He D3 as expected for a view largely determined by high altitudes in the solar atmosphere. It is expected to be visible in H beta (some photospheric contribution here) but, surprisingly, is quite visible in Ca K3. The spectral resolution is about 0.3 angstroms so the Ca K3 line should have very little photospheric "contamination".
Thanks for viewing and hope you enjoy.
Peter.
28 July: Portrait of AR12767 in 4 Fraunhofer Lines.
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Re: 28 July: Portrait of AR12767 in 4 Fraunhofer Lines.
Thanks, Peter. Interesting to see the different views at these wavelengths. The sunspot appears strangely fragmented into multiple cores in Ha compared with how it looks in Ca II K3 or H beta, or are those dark areas just ‘tufts’ of spicules. Hard to tell.
Beautifully done.
Stu.
Beautifully done.
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/
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: 28 July: Portrait of AR12767 in 4 Fraunhofer Lines.
Very nice indeed the plage in Helium D3 seems to match that of Halpha but not of CaK, all fascinating
Alexandra
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Re: 28 July: Portrait of AR12767 in 4 Fraunhofer Lines.
Very interesting, Peter. Thanks for sharing.
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Re: 28 July: Portrait of AR12767 in 4 Fraunhofer Lines.
Always like your comparison shots Peter, they're excellent!
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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: 28 July: Portrait of AR12767 in 4 Fraunhofer Lines.
Thanks for your comments everyone.
Stu: That apparent "fragmentation" of the spot worried me a little. I thought there might have been some sort of glitch in acquiring the spectroheliogram. To investigate a little further, I generated a spectral series of spectroheliograms around H-alpha line centre. Here is an animation showing the result (wavelength offsets in angstroms are shown with positive values implying offsets to the red).
You can see the isolated spot in the continuum (offset = -1.16 angstroms) and then the gradual appearance of some dark "mottles" around the spot which become more visible closer to the line core. I think these are legitimate chromosphere features but can't really identify what they are.
Cheers.
Peter
Stu: That apparent "fragmentation" of the spot worried me a little. I thought there might have been some sort of glitch in acquiring the spectroheliogram. To investigate a little further, I generated a spectral series of spectroheliograms around H-alpha line centre. Here is an animation showing the result (wavelength offsets in angstroms are shown with positive values implying offsets to the red).
You can see the isolated spot in the continuum (offset = -1.16 angstroms) and then the gradual appearance of some dark "mottles" around the spot which become more visible closer to the line core. I think these are legitimate chromosphere features but can't really identify what they are.
Cheers.
Peter