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Old 12-01-2010, 07:22 PM
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Paul Haese
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Paul Haese is offline
 
Join Date: Jan 2009
Location: Adelaide
Posts: 9,991
Very nice images Dennis.

I would like to make a small point about seeing. Many seem to think that the presence of the jet stream or its absence are totally indicative of what the seeing conditions are like. This is in fact not true and I am always trying to inform people as to what can affect seeing.

Good seeing can be obtained even when the jet stream is present. So long as the interaction between the middle level air stream and the jet stream are travelling at a similar speed and direction. Good seeing can be seen even when local winds are present.

Terrestrial conditions also affect seeing. Steep slopes and gullies near by can totally ruin seeing. Large trees etc can also create problems too.

The whole gamit of of conditions can prevail to either give you good seeing or bad seeing. My best night of imaging came when the jet stream on Unisys and WXmaps suggested that the jet stream was moving at 70ms.

My recent Mars/ Saturn and Lunar images came on nights when jet stream was supposed to be 40ms. My location made the real difference and the conditions on the night all came together.

My point being, don't rely on jet stream predictions for the nights or days you image. Go look for yourself.

Rant over, sorry for the diversion and nice images once again.
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