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#1
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'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
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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/ ********************************************** * Attend the 12th Annual NEBRASKA STAR PARTY * * July 31 - Aug. 5, 2005, Merritt Reservoir * * http://www.NebraskaStarParty.org * ********************************************** |
#3
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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
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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
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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
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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
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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
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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
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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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