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Transit of Mercury in the Spicule Layer. Phil took this great image with his Quantum 6 Scope, Solar Spectrum etalon and PGR Camera.
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Moving forward from solar cycle 24 to 25
08Aug Disk: Spectral sweep through H-alpha.
- p_zetner
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08Aug Disk: Spectral sweep through H-alpha.
Hello Everyone.
Here is an animation showing the solar disk in a spectral sweep through the H alpha line. The change in wavelength from one frame to the next is 0.054 Angstroms and the wavelength offset (in milliAngstroms) from line centre is displayed in the upper left portion of the frames.
The spectral bandpass of the spectroheliograph in its present configuration is ~200 milliAngstroms (fwhm).
Cheers, Peter.
Here is an animation showing the solar disk in a spectral sweep through the H alpha line. The change in wavelength from one frame to the next is 0.054 Angstroms and the wavelength offset (in milliAngstroms) from line centre is displayed in the upper left portion of the frames.
The spectral bandpass of the spectroheliograph in its present configuration is ~200 milliAngstroms (fwhm).
Cheers, Peter.
Last edited by p_zetner on Wed Aug 15, 2018 6:36 pm, edited 1 time in total.
- p_zetner
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Re: 08Aug Disk: Spectral sweep through H-alpha.
Here is a montage of the 25 frames of the animation showing the actual intensity variation from frame to frame (a few of the frame numbers are displayed). I eliminated this intensity variation in the animation (using histogram normalization in ImageJ) because it made the central frames of the animation too dim to view. As in the animation, the wavelength offset between adjacent disk images is 0.054 Angstroms.
The montage I posted here was considerably downsized from the original.
I've uploaded a higher resolution version (half original size) with full labelling here:
Thumbnail: https://www.astrobin.com/full/361701/0/
Full resolution: https://www.astrobin.com/full/361701/0/?real=&mod= (needs time to load.)
If I take the mean disk intensity in each frame and plot it (blue crosses) on a measured spectrum it matches the H alpha line profile pretty closely, as expected but always a pleasant surprise when things work out!
The image to the left is an average over 23 frames of a (spectral) calibration video taken with the spectroheliograph. The yellow box shows the region of the spectrum (approximately) that is plotted on the right side of the figure. The spectrum is calibrated in wavelength using line positions from the BASS2000 solar spectrum.
Cheers, Peter.
The montage I posted here was considerably downsized from the original.
I've uploaded a higher resolution version (half original size) with full labelling here:
Thumbnail: https://www.astrobin.com/full/361701/0/
Full resolution: https://www.astrobin.com/full/361701/0/?real=&mod= (needs time to load.)
If I take the mean disk intensity in each frame and plot it (blue crosses) on a measured spectrum it matches the H alpha line profile pretty closely, as expected but always a pleasant surprise when things work out!
The image to the left is an average over 23 frames of a (spectral) calibration video taken with the spectroheliograph. The yellow box shows the region of the spectrum (approximately) that is plotted on the right side of the figure. The spectrum is calibrated in wavelength using line positions from the BASS2000 solar spectrum.
Cheers, Peter.
Last edited by p_zetner on Thu Aug 16, 2018 4:43 pm, edited 1 time in total.
- marktownley
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Re: 08Aug Disk: Spectral sweep through H-alpha.
This is excellent Peter and a reference for all as to what is on band and what is not...

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!
- Montana
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Re: 08Aug Disk: Spectral sweep through H-alpha.
This is a really useful set of images, a bookmark I think 
Thanks for this
Alexandra

Thanks for this

Alexandra
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Re: 08Aug Disk: Spectral sweep through H-alpha.
Marvellous and very informative. Thanks for sharing !
Could you slow do a little bit the movie ?
It seems to me that the "spicules bushes" are best visible at +/- 0.4A.
Could you make another monatge with larger resolution ? Let's say with the solar disk twice the size of this first montage ?
Could you slow do a little bit the movie ?
It seems to me that the "spicules bushes" are best visible at +/- 0.4A.
Could you make another monatge with larger resolution ? Let's say with the solar disk twice the size of this first montage ?
Christian Viladrich
Co-author of "Astronomie Planétaire"
http://www.astroplanetes.com/
Co-author of "Astronomie Solaire"
http://www.astronomiesolaire.com/
Co-author of "Astronomie Planétaire"
http://www.astroplanetes.com/
Co-author of "Astronomie Solaire"
http://www.astronomiesolaire.com/
- p_zetner
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Re: 08Aug Disk: Spectral sweep through H-alpha.
Hi Christian.
The montage I posted here was considerably downsized from the original.
I've uploaded a higher resolution version (half original size) with full labelling here:
Thumbnail: https://www.astrobin.com/full/361701/0/
Full resolution: https://www.astrobin.com/full/361701/0/?real=&mod= (needs time to load.)
Cheers, Peter.
The montage I posted here was considerably downsized from the original.
I've uploaded a higher resolution version (half original size) with full labelling here:
Thumbnail: https://www.astrobin.com/full/361701/0/
Full resolution: https://www.astrobin.com/full/361701/0/?real=&mod= (needs time to load.)
Cheers, Peter.
- Carbon60
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Re: 08Aug Disk: Spectral sweep through H-alpha.
Excellent work, as always, Peter. Very helpful to see the sweep like this.
It's interesting to see the various subtle Doppler effects within the filaments as the sweep progresses through the wavelengths.
Stu.
It's interesting to see the various subtle Doppler effects within the filaments as the sweep progresses through the wavelengths.
Stu.
Lunt LS60THa B1200 PTFT
150mm H-alpha Solar telescope with Lunt35 mod
DMK41, Basler acA1920-155
NEQ6 Pro-mount
Fluxgate Magnetometers (1s and 150s Cadence)
More images at http://www.flickr.com/photos/solarcarbon60/
150mm H-alpha Solar telescope with Lunt35 mod
DMK41, Basler acA1920-155
NEQ6 Pro-mount
Fluxgate Magnetometers (1s and 150s Cadence)
More images at http://www.flickr.com/photos/solarcarbon60/
- p_zetner
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Re: 08Aug Disk: Spectral sweep through H-alpha.
Thanks, Stu.
I find the behaviour of the filaments, as you sweep through the line, interesting as well, especially the one lying halfway between disk centre and the E limb. A part of it seems to persist over a large portion of the sweep, suggesting a high temperature? I'm just finishing some analysis of its spectrum at the moment and will post the results.
Cheers, Peter.
I find the behaviour of the filaments, as you sweep through the line, interesting as well, especially the one lying halfway between disk centre and the E limb. A part of it seems to persist over a large portion of the sweep, suggesting a high temperature? I'm just finishing some analysis of its spectrum at the moment and will post the results.
Cheers, Peter.
Re: 08Aug Disk: Spectral sweep through H-alpha.
Wow~!!! Really very high resolution images!!!!!
Do you have more information about the equipment? Thanks!



Do you have more information about the equipment? Thanks!
Re: 08Aug Disk: Spectral sweep through H-alpha.
you are the master




- MapleRidge
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Re: 08Aug Disk: Spectral sweep through H-alpha.
That is an incredible project Peter...the changes from one extreme to the other are great to see and the transition from frame ot frame in the clip is very smooth. Excellent work
Brian

Brian
Brian Colville
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
Maple Ridge Observatory
Cambray, ON Canada
Photos: https://www.flickr.com/photos/185395281@N08/albums
Re: 08Aug Disk: Spectral sweep through H-alpha.
Fantastic!
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.