Hi Everyone.
Warren's spectacular animation of the huge NW filaprom on the 23rd showed a lot of complex motion.
viewtopic.php?t=36774
Since I was imaging with my SHG on the same day, I thought I would take a look at the prominence spectrum to see if there was any sign of interesting spectral signature of this motion. Here is the result, presented as a montage of 5 hydrogen alpha spectra (images along the left side). The right side images are spectroheliograms with a yellow line indicating the slice of solar disk along which the corresponding spectrum was measured. The red boxes map the portion of the spectrum enclosed to the corresponding length of yellow line in the spectroheliogram. A velocity scale is indicated on the spectrum column of the montage. This is the velocity associated with a Doppler shift from the H alpha line centre.
I was a bit disappointed that there was not much exciting action observable in the spectra. In the past, I've been able to observe very jagged emission line profiles associated with complex prominence motions. See, for example: viewtopic.php?t=12329
In the present case, there is a persistent central absorption core in all of the prom spectra. Since the prom was relatively "low lying" with respect to the limb, this might indicate absorption by the spicule forest between the observer and the prom. The absorption by the intervening spicules would lead to the observed effect since the wider emission profile of the prominence would then be partially masked near the line core. There is a relatively peculiar result visible in image #5 where the spectrum shows two "doughnut" emission shapes within the H absorption profile. These doughnut features actually correspond to the footpoints of the prom as shown in the corresponding spectroheliogram. A bit of a puzzle, which I'm still chewing on!
Cheers.
Peter
23June2022: H alpha prominence spectral analysis
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Re: 23June2022: H alpha prominence spectral analysis
A fantastic study Peter, but I must admit I'm not quite sure what I am looking at. Am I right in thinking that as the spectra in the red boxes have moved to the left there is some blue shift?
Alexandra
Alexandra
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Re: 23June2022: H alpha prominence spectral analysis
Interesting analysis.
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: 23June2022: H alpha prominence spectral analysis
Very interesting, Peter....Science...boom....and I was just happy to have been able to create a spectrum
Stu.
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H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
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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: 23June2022: H alpha prominence spectral analysis
Thanks for the feedback Alexandra, Mark and Stu.
Alexandra, I will work on a better graphic to help explain the observations and post it as soon as I get the chance.
Cheers.
Peter
Alexandra, I will work on a better graphic to help explain the observations and post it as soon as I get the chance.
Cheers.
Peter