13Jun2014 PZ SHG: Ca H Proms
- p_zetner
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13Jun2014 PZ SHG: Ca H Proms
Hello Everyone.
I managed to capture some prominences during the 13June imaging session. Here is a composite image of the H3 image with corresponding proms (separate prom image taken at higher gain).
Producing prominence images at different wavelengths allows analysis of the recession and approach velocities of the plasma.
Here are some "triptych" images in which the centre image corresponds to Ca H line centre and the upper and lower portions of the image show receding and approaching parts of the proms (respectively) at the indicated velocities.
Cheers.
Peter.
I managed to capture some prominences during the 13June imaging session. Here is a composite image of the H3 image with corresponding proms (separate prom image taken at higher gain).
Producing prominence images at different wavelengths allows analysis of the recession and approach velocities of the plasma.
Here are some "triptych" images in which the centre image corresponds to Ca H line centre and the upper and lower portions of the image show receding and approaching parts of the proms (respectively) at the indicated velocities.
Cheers.
Peter.
- swisswalter
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Re: 13Jun2014 PZ SHG: Ca H Proms
Hi Peter
a fantastic study
a fantastic study
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: 13Jun2014 PZ SHG: Ca H Proms
Wow! This is very cool stuff!
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: 13Jun2014 PZ SHG: Ca H Proms
Mark, et al,
This is one of the benefits of having a SHG...
You can quickly record the spectral AVI then select which wavelength you want to process...all the data is already there....
This is one of the benefits of having a SHG...
You can quickly record the spectral AVI then select which wavelength you want to process...all the data is already there....
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
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Re: 13Jun2014 PZ SHG: Ca H Proms
Thanks Walter, Mark, Derek and Alexandra.
Glad you enjoyed the study. Ideally, I should animate these results, doing a "spectral sweep" of the proms. I'll work on that!
Cheers.
Peter.
Glad you enjoyed the study. Ideally, I should animate these results, doing a "spectral sweep" of the proms. I'll work on that!
Cheers.
Peter.
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Re: 13Jun2014 PZ SHG: Ca H Proms
Yes, was playing around with a Shelyak last weekend and must say that i'm very interested in the concept. I just need to get my head around it a bit more yet before I take the plungeMerlin66 wrote:Mark, et al,
This is one of the benefits of having a SHG...
You can quickly record the spectral AVI then select which wavelength you want to process...all the data is already there....
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!
- DSobserver
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Re: 13Jun2014 PZ SHG: Ca H Proms
Amazing work Peter!
Have you tried to colour each image with a different Doppler shift and then stack them?
Have you tried to colour each image with a different Doppler shift and then stack them?
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Re: 13Jun2014 PZ SHG: Ca H Proms
Hi Alex.
That was my original plan! My attempt to do this was kind of simple minded. For example, I took the prom images at + 8.46 km/s, centre line (v=0) and - 8.46 km/s and copied them into the R, G and B channels, respectively, of an RGB image. Here's what I got:
I'm not all that happy with the result. It's easier to see velocity differences in the separate monochrome images, as presented above. Is there something else I could be doing to emphasize the colour coding? Even in the simple minded colour image here, I'm not sure how to interpret the colour yellow, for example.
Cheers (and thanks for the suggestion).
Peter.
That was my original plan! My attempt to do this was kind of simple minded. For example, I took the prom images at + 8.46 km/s, centre line (v=0) and - 8.46 km/s and copied them into the R, G and B channels, respectively, of an RGB image. Here's what I got:
I'm not all that happy with the result. It's easier to see velocity differences in the separate monochrome images, as presented above. Is there something else I could be doing to emphasize the colour coding? Even in the simple minded colour image here, I'm not sure how to interpret the colour yellow, for example.
Cheers (and thanks for the suggestion).
Peter.
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Re: 13Jun2014 PZ SHG: Ca H Proms
Hi Peter
very interesting. What happens if you use only red and blue and let the zero velocity White?
very interesting. What happens if you use only red and blue and let the zero velocity White?
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
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
Re: 13Jun2014 PZ SHG: Ca H Proms
Hello Peter!
I'd do exactly what you did. This is interesting so I will check if there's more to be done.
You're ,really,been doing nice and interesting work!
Cheers
Alex
BTW it seems I've missed this post http://solarchat.natca.net/viewtopic.php?f=4&t=6265
Just referring to it as a comparison.
I'd do exactly what you did. This is interesting so I will check if there's more to be done.
You're ,really,been doing nice and interesting work!
Cheers
Alex
BTW it seems I've missed this post http://solarchat.natca.net/viewtopic.php?f=4&t=6265
Just referring to it as a comparison.
Last edited by alex on Sat Jun 21, 2014 6:45 am, edited 1 time in total.
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Re: 13Jun2014 PZ SHG: Ca H Proms
Good stuff Peter!
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: 13Jun2014 PZ SHG: Ca H Proms
Thanks Everyone.
Alex, thank you very much for the comments and the link. I'm familiar with Jim Ferreira's work (http://www.lafterhall.com/halpha_sun.html). He used a tunable Daystar filter to take images at line centre and in the red and blue wings of H alpha. The only flaw with this technique is the time elapsed (about 10-15 mins) for the heating or cooling of the filter to retune, during which the prominences can change slightly. This may not be significant. It's certainly not an issue with SHG images, where all the spectral data of an image is collected simultaneously.
It turns out that Phil Rousselle has a good discussion on the production of Dopplergrams. It involves taking differences of images, which I have not done. Phil presents the results in animation form, which may be the best way to go. I'll investigate the colour coding idea some more.
http://www.astrosurf.com/spectrohelio/doppler-en.php
Cheers.
Peter.
Alex, thank you very much for the comments and the link. I'm familiar with Jim Ferreira's work (http://www.lafterhall.com/halpha_sun.html). He used a tunable Daystar filter to take images at line centre and in the red and blue wings of H alpha. The only flaw with this technique is the time elapsed (about 10-15 mins) for the heating or cooling of the filter to retune, during which the prominences can change slightly. This may not be significant. It's certainly not an issue with SHG images, where all the spectral data of an image is collected simultaneously.
It turns out that Phil Rousselle has a good discussion on the production of Dopplergrams. It involves taking differences of images, which I have not done. Phil presents the results in animation form, which may be the best way to go. I'll investigate the colour coding idea some more.
http://www.astrosurf.com/spectrohelio/doppler-en.php
Cheers.
Peter.
Re: 13Jun2014 PZ SHG: Ca H Proms
Thanks for that link Peter!
I guess the wavelength difference makes sense,becaus eit is also in the redshift formula.
Looking forward to see how you go on
I guess the wavelength difference makes sense,becaus eit is also in the redshift formula.
Looking forward to see how you go on
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Re: 13Jun2014 PZ SHG: Ca H Proms
Hi Wah
a very interesting animation
a very interesting animation
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
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa