Somebody observed this Solar Cyclon on September 30, near to AR12176 ???

[uranus7 0]

Filming the area around AR12176 on September 30, I thought that the circle lied on the left side of the frame is probably a big dust "donut" on one of lens or maybe on the sensor. BUT IT ISN't, because you may observe that the "circle" is in fact part of the disk. The round shape of the plasma already rise a bit (darken appearance) is the specific sign of the Sun Cyclons. Look here:

https://www.youtube.com/watch?v=n6wpPb74-SY&feature=youtu.be

I also had the chance to film, in H-alpha spectrum, a more intense Solar Cyclon, on February 28, 2013. This is the film which I captured then:

https://www.youtube.com/watch?v=qNjtm5teWEU

Gabriel

[polo0258 38 622]

very good ,i never see that!!
polo

[uranus7 0]

Thanks, Polo. The Solar Cyclons are very rare, interesting phenomenons, also respecting quite the same laws as on the Earth.

[Ce message a été modifié par uranus7 (Édité le 03-10-2014).]

[polo0258 38 622]

one small up!

[christian viladrich 7 739]

Hi,

There is no cyclone (or huricane) on the sun. All is about electromagnetism ;-)
What you see is just the combination of low resolution and poor seeing conditions.

In Halpha, features can show many shapes, and can occasionally look round or circular.

Just think about the "face" on the Mars imaged years ago...

[uranus7 0]

Christian,

The second link with my previously personal record from 2013, it's about this one:

https://www.youtube.com/watch?

describe a Solar Cyclone which was already identified by specialists, as being a Solar Cyclone at that time.

So, I have no prove that my record of September 30, 2014, isn't a very small Cyclon.

Of course all is about electromagnetism and better saying magnetohydrodynamics but the name of Solar Cyclone is already dedicated for such kind of phenomenons. I guess you didn't thought that I imagined kind of winds on chromosphere... )

"What you see is just the combination of low resolution and poor seeing conditions."

Sorry but that day (Sept 30) the sky was clear enough and my resolution is 1900x1200 (or do you refer the scope resolution?), much enough to shot at a Focal Length greater than 10 meters and to obtain very good details. So, with all my efforts, I can't take in account your above assertion, then. Just look at the image obtained by me and posted here, for AR12176.It's too clear for taking in account a bad seeing.

"In Halpha, features can show many shapes, and can occasionally look round or circular."

Yes, the filaments are "handled" by strong electromagnetic fields, but all became suspicious when the "circle" is almost perfect and also is quasi-stationary as position related to the Sun.Then we can identify a so called Solar Cyclon there, without doubt.

You may read here some about Solar Cyclones:

http://adsabs.harvard.edu/abs/2012PASJ...64L...4M

" Abstract

An innovative solar observing satellite, Hinode, has successfully observed the detailed evolution of an emerging magnetic field, starting from its appearance at the solar surface, to forming a developed bipolar region. The high spatial and temporal resolutions provided by the satellite has enabled us to capture prominent dynamic phenomena caused by the emerging magnetic field, such as a running wave in a chromospheric layer and the rotation of a magnetic polarity region on the Sun, which is reminiscent of a cyclone on Earth. A possible mechanism for producing the chromospheric running wave spreading from a solar cyclone has been demonstrated with a three-dimensional magnetohydrodynamic simulation for the emergence of a twisted flux tube. The simulation shows that as the emergence proceeds, an arc-shaped region with enhanced plasma density propagates outwards from the site of emergence. "

Gabriel

[Ce message a été modifié par uranus7 (Édité le 04-10-2014).]

[christian viladrich 7 739]

Hi Gabriel,

Thanks for the link to T. Magara paper.

You said "The Solar Cyclons are very rare, interesting phenomenons, also respecting quite the same laws as on the Earth".

This is not true : the physics of cyclons / huricanes on earth (or Jupiter, Uranus, etc) is all about pressure and velocity.
The physics of the photosphere and chromosphere is all about magnetohydrodynamics (and a bit of convection for the photophere) ;-)

The paper is about "chromospheric running wave". Maybe I didn't read it carefully, but I can't see anything related to "ringshape" features in this paper.

BTW, you can see at the bottom of this thread an example of a solar image with "good details" : http://www.astrosurf.com/ubb/Forum3/HTML/041938.html

Keep on observing the sun. It's fun. You can join also Solar-Alpo group if you want to share images.

[Ce message a été modifié par christian viladrich (Édité le 04-10-2014).]

[uranus7 0]

Well Christian, then I will post a WL image with better details.
I don't pretend I had the best transparency for my last WL posted picture but the seeing was ok.
Regarding the image which you mentioned, those from the bottom of this thread, is taken at a greater FL, at a non-inspired moment regarding the transparency for that FL and also the contrasts are flat. The edge's intensity is also week, ruining the 3-D impression. The granules appear as being all flat. Believe me, I know to see an astro picture in WL and H-alpha.

Hope I'll have some day the opportunity to have an excellent seeing and transparency and I'll show you what a good quality in WL means.

There are at least 2 main characteristics very important at a WL and H-alpha image: the clarity for a deep resolution of details (as much tiny) and the 3-D aspect of shapes. Yes, the Photosphere and Chromosphere have 3-Dimensional aspects for their components and any imager must suggest it, for sure, by his own skills.

Cheers,

Gabriel

[Ce message a été modifié par uranus7 (Édité le 04-10-2014).]

[christian viladrich 7 739]

Hi Gabriel,

Further to the "solar cylons", here are some videos you've probably already seen about "solar tornadoes" (taken with SDO) :

More information and videos here : http://users.aber.ac.uk/xxl/tornado.htm

I don't know how far this is related to what you have on your images.

Cheers

[Ce message a été modifié par christian viladrich (Édité le 04-10-2014).]

[uranus7 0]

Hi Christian and thank you for the video clip and link.

Probably when such "tornadoes" aren't seen lying on limb, but they are lying somewhere on the disk, then can appear as kind of circles.

Anyway, I am impressed that I catched this kind of filament structures (plasma structures) in H-alpha but in white light spectrum also.

Sometime ago, I captured kind of rotating prominence, which can probably belong to the same category of "solar tornadoes".
I'm speaking about this shape:

Regards,

Gabriel

[Ce message a été modifié par uranus7 (Édité le 05-10-2014).]