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 Post subject: Re: SUN in PST
PostPosted: Sat Aug 08, 2015 9:38 am 
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Location: Lancashire
The Sun looked superbly sharp in the double-stacked Lunt/PST yesterday evening: prominences, filaments, plages ( with particular reference to the large sunspot group currently visible ) and the supergranulation, stood out in sharp relief.
Rarely do we reach this level of clarity in the north-west. There wasn't time to use the 70mm modded PST, due to the Sun slipping behind the roof of the house opposite. Maybe later today.. :D .

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 Post subject: Re: SUN in PST
PostPosted: Sat Aug 22, 2015 2:29 pm 
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2015 August 22 0904 until 0906 UTC, considerable high cloud, transparency fair contrast fair to poor seeing fair PST 32 times.

There is a prominence at the 12 o'clock position inverted altazimuth view. Another large prominence at the 1230 position.
There is a massive thick arch prominence around the 2 o'clock position. The right-hand side of this is I suppose a plume.

There are a few small filaments.

There is a large white area above centre disc with two sunspots, one at the top end and another at the bottom end, which is larger.
There is a small white area to the lower left nearing the limb.

09 20 UTC wind 100° 5 kn 23°C TDP 16°C 1015 Hector pascals.
1018 UTC wind 100° 7 kn visibility 40 km cloud broken 25,000 feet 24°C TDP 16°C 1015 Hector pascals.

1236 UTC in the Street.
There are at least four types of cloud. With I think some lenticular clouds, three in number. It is about 3/8 or 4/8 cloud and it is hot in the sun, about 30°C.
White light.
Welders glass 13 unaided eyes and Astro specs.
There is a sunspot below and to the left of centre disc. I estimate the penumbral size as 51 arc seconds.

1300 UTC 160° 11 kn visibility 50 km cloud few 5000 feet scattered 7000 feet 30°C TDP 15°C 1012 Hector pascals.

Regards, David


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 Post subject: Re: SUN in PST
PostPosted: Thu Sep 17, 2015 2:47 pm 
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Location: Lancashire
Yesterday afternoon at 18:00 BST, an enormous prominence was seen at the 3 o'clock position in the Lunt/PST double-stack, through double-glazing.
Being thousands of miles high and many thousands more longer, it's difficult to know what classification it came under. Perhaps a "sheet" of plasma might be appropriate, but not quite a "hedgerow" in its morphology, as it didn't look bushy.
Very impressive and distinct.

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 Post subject: Re: SUN in PST
PostPosted: Thu Sep 17, 2015 5:02 pm 
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Joined: Sat Dec 11, 2004 8:18 pm
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Location: Manchester
Dear Brian
Yes, I think it was the same prominence I observed & imaged myself 16th September.
If I can I might try to display my image on the "gallery".
Best wishes from Cliff


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 Post subject: Re: SUN in PST
PostPosted: Fri Sep 18, 2015 9:21 am 
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Location: Lancashire
Hi Cliff. The prom has been classified as of the hedgerow type. See today's www.spaceweather.com.

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 Post subject: Re: SUN in PST
PostPosted: Tue Jul 11, 2017 3:36 pm 
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Location: Lancashire
Has anyone been monitoring sunspot AR 2665 in H-a light? It's cloudy at this site, but the current SDO ( Solar Dynamics Observatory ) solar image seems to show intensively white flaring in regions of the sunspot.

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