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General Astronomy >> Beginners Forum

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BigC
Carpal Tunnel
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Reged: 09/29/10

Loc: SE Indiana
Re: I have had the chance to go up to 22000 feet new [Re: GlennLeDrew]
      #5672401 - 02/10/13 01:48 PM

In my case have been considering rooftop or elevated platform to avoid the low-lying ground fog common here.Often there is a visibly dense layer about chest high above the ground.Yet the air above is much less foggy.One can see the effect over grassy fields early many mornings as well.I'm thinking getting above that might increase the number of viewing nights.

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RedLionNJ
scholastic sledgehammer


Reged: 12/29/09

Loc: Red Lion, NJ, USA
Re: I have had the chance to go up to 22000 feet new [Re: BigC]
      #5672674 - 02/10/13 04:46 PM

Totally depends on your purpose for going higher. Personally, with a very few exceptions, I've found seeing to be significantly poorer in mountain environments. Give me that sluggish, thick airmass for planetary viewing anyday. Once in a while you might get better seeing at altitude, but I'd take predictability over chance.

Grant


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Tony Flanders
Postmaster
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Reged: 05/18/06

Loc: Cambridge, MA, USA
Re: I have had the chance to go up to 22000 feet new [Re: RedLionNJ]
      #5672945 - 02/10/13 07:46 PM

Quote:

With a very few exceptions, I've found seeing to be significantly poorer in mountain environments.




Obviously, that's not always true -- there's a reason major observatories are built on mountaintops! A general rule of thumb is that the seeing is best at or near the top on the windward side of a mountain, and tends to be terrible in the lee. Which makes sense if you know anything about fluid flow. Think, for instance, of a boat's smooth bow wave and turbulent wake.


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