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'forest' of solar proms



 
 
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  #1  
Old September 20th 05, 04:30 PM
nytecam[_1_] nytecam[_1_] is offline
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Default 'forest' of solar proms

Dearth of solar proms in H-alpha of late but nice 'forest' prom over wide arc of approaching east limb today posted at

http://home.freeuk.com/m.gavin/pstnew.htm

Proms associated with 'aurora' spot gp #798 [now passed over west limb] also included.

Nytecam
51N 0.1W
  #2  
Old September 20th 05, 11:08 PM
David Knisely
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Well, Big Bear is kind of down, but there is indeed a huge quiescent
prominence on the east limb. It is a long disturbed hedgerow-type with
an arch-like section that looks like it is approaching "breakoff height"
(50,000 km). The arch-like form of the southern half is a bit frayed
along the top with only two footpoints, so it might eventually break off
and float away in a disparition brusque eruption. So far it shows no
signs of moving upwards just yet. It shows up fairly well in the NSO
Sacramento Peak (Limb Darkening Subtracted) image at 2130 UT. I do like
the NSO images: http://nsosp.nso.edu/data/latest_solar_images.html , as
they are of medium scale which matches what I see in the PST fairly
well, although the contrast is boosted to an extreme. There is also
some smaller but brighter action along the western limb where that giant
delta group 10808 has gone around. It put up a couple of narrow surges
and one brilliant but small arch while I was watching it with my PST.
On the disk, there is only one active region with spots at it looks to
be just a regular extended Beta group with a moderate-sized leading spot
with penumbra and a cluster of smaller trailers. Two of the trailing
spots appear to have at least rudimentary penumbrae, but the tiny broken
stuff nearest the big leading spot may just be penumbral fragments.
The plage around the trailers is extensive and fairly bright (and a
little sinuous too although I don't see much in the way of major active
region filaments or a highly organized arch filament system inside the
group). One narrow section of plage got fairly bright around noon, but
when I looked back at it at 4 p.m., it had faded. There are a few
quiet region filaments on the disk with the largest being again somewhat
towards the eastern limb and a nice group of smaller fainter ones near
the center of the disk. Looks like things have settled down for a
while. I am starting to watch for the very first higher-latitude spots
of the next cycle, as we are probably getting close to the period when
they might start to appear (generally 18 months before the end of the
current cycle). Clear skies to you.
--
David W. Knisely
Prairie Astronomy Club:
http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

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  #3  
Old September 21st 05, 05:20 AM
Michael McCulloch
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On Tue, 20 Sep 2005 17:08:19 -0500, David Knisely
wrote:

Well, Big Bear is kind of down, but there is indeed a huge quiescent
prominence on the east limb. It is a long disturbed hedgerow-type with
an arch-like section that looks like it is approaching "breakoff height"
(50,000 km). The arch-like form of the southern half is a bit frayed
along the top with only two footpoints, so it might eventually break off
and float away in a disparition brusque eruption.


I captured the arcing prominence shape at about 21h UT:

http://gamesforone.com/stars/images/sun9-20-05.jpg

I just used a tripod (i.e. no tracking) and the elevation at that time
of day was not the greatest for seeing, but the prom was quite
impressive in the PST.

---
Michael McCulloch
  #4  
Old September 21st 05, 05:55 AM
Davoud
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Michael McCulloch:
I captured the arcing prominence shape at about 21h UT:
http://gamesforone.com/stars/images/sun9-20-05.jpg


Wow! You certainly did!

I just used a tripod (i.e. no tracking) and the elevation at that time
of day was not the greatest for seeing, but the prom was quite
impressive in the PST.


It don't make no never mind. The image is also impressive on your web
page.

Davoud

--
usenet *at* davidillig dawt com
  #5  
Old September 21st 05, 03:46 PM
nytecam[_1_] nytecam[_1_] is offline
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[quote=Michael McCulloch]On Tue, 20 Sep 2005 17:08:19 -0500, David Knisely

The arch-like form of the southern half is a bit frayed
along the top with only two footpoints, so it might eventually break off
and float away in a disparition brusque eruption.[/i][/color]

I captured the arcing prominence shape at about 21h UT:

http://gamesforone.com/stars/images/sun9-20-05.jpg

Michael McCulloch

Lift-off ! less than 24 hours after my original posting part of the prom has launched itself into space and detached from the limb. Awaiting clear slot to record it - its hereafter !

http://home.freeuk.com/m.gavin/pstnew.htm
Nytecam
51N 0.1W

Last edited by nytecam : September 21st 05 at 04:57 PM.
  #6  
Old September 21st 05, 06:17 PM
Thomas Farrsby
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"nytecam" wrote in message
news:nytecam.1vo1lm@spacebant


wow the sketches here http://home.freeuk.com/m.gavin/solold.htm can pass
for art!!


  #7  
Old September 21st 05, 06:37 PM
Brian Tung
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Michael McCulloch wrote:
I captured the arcing prominence shape at about 21h UT:

http://gamesforone.com/stars/images/sun9-20-05.jpg


It got bigger. I got out my SM40 at about 0h UT, and the southern
half of that prominence had simply erupted, and was making its way out
into space, I think. It was perhaps 200,000 km long--one of only a few
I have seen this year that were that long.

Anyone in east Asia catch the rest of it? I only had a minute or two
to look at it--one of the advantages of having a nice portable H-alpha
set-up at your disposal.

--
Brian Tung
The Astronomy Corner at http://astro.isi.edu/
Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/
The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/
My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.txt
  #8  
Old September 21st 05, 08:49 PM
David Knisely
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At 1945 UT (Sept. 21st), the section that broke loose is sort of
"hovering" above the edge of the limb, looking like a wind-torn cloud.
The other section still attached may be another separate quiescent
prominence that just happened to be close to the one which broke loose,
as it has well-defined borders and lots of footpoints. There is also a
very nice low irregular loop on the northeast limb and a small but
bright surge on the south-southeastern limb. Clear skies to you.
--
David W. Knisely
Prairie Astronomy Club:
http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/

**********************************************
* Attend the 13th Annual NEBRASKA STAR PARTY *
* July 23-28, 2006, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
**********************************************

  #9  
Old September 22nd 05, 08:27 AM
Dave Mitsky
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David,

I noted the detached section at approximately 1630 UT while I was
observing the Sun early yesterday afternoon with my Coronado PST.

Dave Mitsky

 




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