Quiescent Prominence Bubbles and Dark Plumes

[DeepSolar64]

We have also seen an excellent talk by Tom Berger. It would be super interesting to have him present specifically on prominences and filaments._Averton

True that!! I agree.

[eroel]

Hi Jim:
Thanks for the interesting information, images and animations.
Best regards.
Eric.

[oriolestation]

Warren. Indeed, a well formed plume is beginning to rise. Not seeing the bubble that produced the plume indicates the prominence is on the far side of the the limb. A well formed bubble cavity is clearly recorded as well, and down flow plasma build up can be seen at top right of the bubble. This is excellent! Bravo!

[Montana]

These are absolutely incredible and certainly a formation needing studying

Can I add this thread to the collection viewtopic.php?p=285093&hilit=bubble+andy+devey#p285093

Alexandra

[rigel123]

Not sure about this one from today. Only 15 minutes in time, but it appears there may be two plumes, one on the left of the main prom and one in the middle that I might have caught after they formed, but not positive. Seeing was horrendous so not the best.

SE-Limb-Animation-3-8-2023 by Rigel123, on Flickr

[oriolestation]

Not sure about this one from today. Only 15 minutes in time, but it appears there may be two plumes, one on the left of the main prom and one in the middle that I might have caught after they formed, but not positive. Seeing was horrendous so not the best.

There certainly appear to be two rising plumes as you describe. Is this shot with your double stack system?

[oriolestation]

These are absolutely incredible and certainly a formation needing studying

Can I add this thread to the collection viewtopic.php?p=285093&hilit=bubble+andy+devey#p285093

Alexandra

Oh, yes. Seems to be interest in the subject. Cool.

[rigel123]

Not sure about this one from today. Only 15 minutes in time, but it appears there may be two plumes, one on the left of the main prom and one in the middle that I might have caught after they formed, but not positive. Seeing was horrendous so not the best.

There certainly appear to be two rising plumes as you describe. Is this shot with your double stack system?

Yes, that is with the Lunt LS60T DS. When I saw the prom I thought it might be a likely candidate but was really skeptical that my 15 minute window would catch anything!

[oriolestation]

[DeepSolar64]

I am beginning to realize, many of the dark areas we see in prominences are low density hot plasma! Not true voids at all. I will certainly look closer at prominences in the future and use my SMII90 to image them!

People here like Warren and Martin Symonds who do animations will have the most to contribute.

This is a really interesting topic.

James

[rigel123]

That has to be a textbook example of the formation of a plume!

[DeepSolar64]

And Paul has posted a grand example of bubbles and dark plumes in another post!

[oriolestation]

Solar Powered Lava Lamp

[DeepSolar64]

It does resemble a Lava Lamp!!

[Carbon60]

Very interesting, Jim. Thank you for presenting a beautifully detailed set of image sequences. Fascinating work.

Just a comment about things being visible, or not, we have to remember that we are observing at a very narrow bandwidth, so if the object is not emitting on the Ha line, then we will not see it. I have no idea what the bubbles are, but if they are hotter plasma they could appear dark in Ha for this reason, but could also appear bright if observed at some other higher energy, shorter wavelength. It depends on the temperature of the material within the bubbles. I’m curious to know if there’s any evidence of ‘hot’ emission bubbles from satellite images (SDO, Parker, Solar Orbiter etc). I haven’t read any of the reference material on this, so I don’t know what supporting evidence for hot bubbles has been presented. Maybe this has already been considered.

Whatever the answer is, it’s a fascinating subject.

Stu.

[rigel123]

Very interesting, Jim. Thank you for presenting a beautifully detailed set of image sequences. Fascinating work.

Just a comment about things being visible, or not, we have to remember that we are observing at a very narrow bandwidth, so if the object is not emitting on the Ha line, then we will not see it. I have no idea what the bubbles are, but if they are hotter plasma they could appear dark in Ha for this reason, but could also appear bright if observed at some other higher energy, shorter wavelength. It depends on the temperature of the material within the bubbles. I’m curious to know if there’s any evidence of ‘hot’ emission bubbles from satellite images (SDO, Parker, Solar Orbiter etc). I haven’t read any of the reference material on this, so I don’t know what supporting evidence for hot bubbles has been presented. Maybe this has already been considered.

Whatever the answer is, it’s a fascinating subject.

Stu.

This could add to the challenge for those with good CaK setups to see if they can catch any bubbles/plumes to compare to those we see in Ha.

[oriolestation]

Very interesting, Jim. Thank you for presenting a beautifully detailed set of image sequences. Fascinating work.

Just a comment about things being visible, or not, we have to remember that we are observing at a very narrow bandwidth, so if the object is not emitting on the Ha line, then we will not see it. I have no idea what the bubbles are, but if they are hotter plasma they could appear dark in Ha for this reason, but could also appear bright if observed at some other higher energy, shorter wavelength. It depends on the temperature of the material within the bubbles. I’m curious to know if there’s any evidence of ‘hot’ emission bubbles from satellite images (SDO, Parker, Solar Orbiter etc). I haven’t read any of the reference material on this, so I don’t know what supporting evidence for hot bubbles has been presented. Maybe this has already been considered.

Whatever the answer is, it’s a fascinating subject.

Stu.

This paper by Berger addresses the bubbles being dark due to lower density despite high temperature, not unlike the dark corona background sky behind bright prominences on the limb.

Quiescent Prominence Dynamics Observed With The Hinode Solar Optical Telesocpe. I. Turbulent Upflow Plumes Thomas E. Berger, et al.
The Astronomical Journal, 716:1288-1307, 2010 June 20

[oriolestation]

Very interesting, Jim. Thank you for presenting a beautifully detailed set of image sequences. Fascinating work.

Just a comment about things being visible, or not, we have to remember that we are observing at a very narrow bandwidth, so if the object is not emitting on the Ha line, then we will not see it. I have no idea what the bubbles are, but if they are hotter plasma they could appear dark in Ha for this reason, but could also appear bright if observed at some other higher energy, shorter wavelength. It depends on the temperature of the material within the bubbles. I’m curious to know if there’s any evidence of ‘hot’ emission bubbles from satellite images (SDO, Parker, Solar Orbiter etc). I haven’t read any of the reference material on this, so I don’t know what supporting evidence for hot bubbles has been presented. Maybe this has already been considered.

Whatever the answer is, it’s a fascinating subject.

Stu.

Stu
All of the researchers I'm aware of studying bubble voids and dark plumes are using data from the Hinode/SOT, the New Vacuum Solar Telescope (NVST) or the Solar Dynamic Observatory (SDO). The NVST researchers in China are the only ones I'm aware of utilizing a ground based instrument, though, I suspect Big Bear Solar Observatory and the Swedish 1 meter scope, and probably a few others are being utilized as well.

The Hinode/SOT, both H-alpha and Ca II. The SDO EUV images are with the Atmospheric Imaging Assembly typically at 171A and 193A, and at those wavelengths the material in the bubbles and plumes are in emission, and brighter than the coronal atmosphere above the prominence (!!!).

Fascinating stuff, indeed!

[DeepSolar64]

I would love to see very high resolution images in the 656.28nm Ha wavelength. Imagine very high resolution prominences without the effects of atmospheric seeing. I don't even see enough very high resolution images from the large ground based professional telescopes in Ha and have never seen any from space to the best of my memory. SDO is great but except for continuum it only images in the deep ultraviolet range.

I see Ha images here on SolarChat better than ANY professional image I have seen. White light is different. I have seen some astounding ones of the photosphere done by professionals. I am waiting on the 4 meter DKIST team to publish more. Surely 4 meters of solar aperture can put us to shame in ANY wavelength that gets through out planet's atmosphere.

Hmm...

James

[Montana]

This is an absolutely fascinating subject and I may move this post to the prominences section later so as not to lose this precious info (easier to find). I will sort out that prominences section at some point but not until May when I have more time
Prominences are really exciting!

Alexandra

[oriolestation]

I would love to see very high resolution images in the 656.28nm Ha wavelength. Imagine very high resolution prominences without the effects of atmospheric seeing. I don't even see enough very high resolution images from the large ground based professional telescopes in Ha and have never seen any from space to the best of my memory. SDO is great but except for continuum it only images in the deep ultraviolet range.

I see Ha images here on SolarChat better than ANY professional image I have seen. White light is different. I have seen some astounding ones of the photosphere done by professionals. I am waiting on the 4 meter DKIST team to publish more. Surely 4 meters of solar aperture can put us to shame in ANY wavelength that gets through out planet's atmosphere.

Hmm...

James

Too true. The vast majority of satellite base solar observing is done with shorter wavelength systems. Most of the Hinode/SOT stuff that I have seen are recorded at the Ca H line 3960A, the results are higher resolution than images at H-alpha at 6563A.

This Hinode/SOT image of the solar limb is recorded at Ca H wavelength. Incredibly fine structure resolved.

[DeepSolar64]

Jim,
Where are you getting your Hinode/SOT data? What website?

James.

[oriolestation]

Jim,
Where are you getting your Hinode/SOT data? What website?

James.

Mostly from published papers. But they do have a web site.

https://hinode.nao.ac.jp/en/intro/

[oriolestation]

This is a fantastic movie by Hinode/SOT of a polar crown prominence in Ca H

https://science.nasa.gov/files/atoms/fi ... _short.mov

Woot!

[Averton]

This is a fantastic movie by Hinode/SOT of a polar crown prominence in Ca H

https://science.nasa.gov/files/atoms/fi ... _short.mov

Woot!

Wow, exceptional - absolutely fascinating to watch!