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AR 2833 animation with penumbral waves

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#1 torsinadoc

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Posted 20 June 2021 - 06:14 AM

There was an interesting post on solarchatforum about penumbral waves. I decided to reprocess my prior animation of AR2833 to try and tease them out.

This is a large file (approx 90mb) so it will take time to load
51258177137_391efae519_o.gifAR2833 Animation with penumbral waves by Diamond, Alan, on Flickr

Direct link to the animation
live.staticflickr.com/65535/51258177137_391efae519_o.gif

I couldn't find much on the net (free)
https://iopscience.i...538-4357/aa9c47

Edited by torsinadoc, 20 June 2021 - 06:24 AM.

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#2 Mike G.

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Posted 20 June 2021 - 06:37 AM

WOW!  Very nice!


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#3 Great Attractor

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Posted 20 June 2021 - 06:40 AM

I think this is the first paper on them: Observations of Running Penumbral Waves (1972)

 

 

While reviewing Hα films of the preceding sunspot of Mount Wilson 18090, taken 1970 September 1 at Big Bear, one of us (A. S.) discovered a series of concentric intensity waves propagating outward through the penumbra of the sunspot (Stein and Zirin 1972). Examination of other films revealed that such waves were visible on other occassions; with subsequent improvements in our instrumental resolution, we have seen them under reasonably good seeing in every sizable sunspot with a stable, regular penumbra.

(...)

The running penumbral waves (henceforth referred to as RP waves; the term “Stein waves” is also colloquially used) are seen in figure 1 (plate L4) to consist of successive bright and dark bands expanding outward from the umbra-penumbra boundary. They start out as circular arcs, and propagate more or less uniformly outward (depending on the irregularity of the penumbra).

 

There's a lot of newer ones on arxiv.

 

It's awesome that 50 years later we can easily catch them in excellent quality with a <100 mm amateur-grade Hα scope.


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#4 torsinadoc

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Posted 20 June 2021 - 06:42 AM

I think this is the first paper on them: Observations of Running Penumbral Waves (1972)

 

 

There's a lot of newer ones on arxiv.

 

It's awesome that 50 years later we can easily catch them in excellent quality with a <100 mm amateur-grade Hα scope.

thanks



#5 rigel123

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Posted 20 June 2021 - 12:23 PM

The detail is fantastic Alan!



#6 torsinadoc

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Posted 20 June 2021 - 03:18 PM

The detail is fantastic Alan!

Thanks!.  




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