As a CCD user I feel the need for a method of measuring "atmospheric seeing" that is specifically directed to what a CCD records after a well-guided long...
Not being a CCD photographer I dont know of one. But I know just enought about the instrumentation to speculate that if one turned off one's drive, exposed for...
Hi Gary... Actually, I am trying to find the best way to corrolate the seeing forecast to CCD applications. Lately, I did only 3 sessions of CCD to look at the...
... Isnt it more complicated that that? Peridoic error in the drive would introduce a regular woble with a perioud of a minute or two. Atmosphereic refraction...
Attila and Allan, Thanks to both of you for excellent suggestions. Turning off the sidereal drive and registering a star track on the CCD strikes me as a ...
Are the current seeing forecasts at clear sky clocks using sounding data from balloon radiosondes? I am just starting off into the world of "astronomic seeing"...
Concerning the "atmospheric seeing" forecast challenge: An observer's experience of "atmospheric seeing" may depend on the telescope altitude above ground....
... wrote: > ... as they ... tropopause ... I hope Allan replies in detail. But I know a little of how he does it. His own data, 541 observations of seeing...
... can mesure the average amplitude of this wave to measure CCD >seeing. Isnt it more complicated that that? Peridoic error in the drive would introduce a...
Thanks Bruce for your ''think out loud''. I always enjoy reading your thoughts and these express my thoughts as well. I agree with most of the item you...
Shannon, Yes the baloon soundings are used in the analysis. When I started with my study, I had the same question than you regarding the lifted and richardson...
Attilla is a good student, Indeed, the corrolations is higher with low level wind than the tropopause. It doesn't mean the tropopause doesn't create seeing,...
I've created a couple of folders for links. I've added all of the astronomy-specific weather sites that I know. http://makeashorterlink.com/?Q56A353A1 Please...
I sometimes get asked for long term cloud cover stats, like the number of clear hours per month, for some specific latitude and longitude. (Seems like...
I have a "sunshine map" from an old geography book (that my daughter used as a coloring book), and I'll attach a copy of it here. I don't know if image...
Here's a link to a "sunshine map" of the United States (that I just created, since my attachment on a previous posting got stripped). Sorry Canada isn't...
Thanks Your charts pretty much confirm what I thought: I live in a cloudy spot I think it's very odd that sunshine/cloudyness data isnt more common on the web....
I'd like to put the answer to this on in a FAQ: Q: If water vapor is a clear colorless gas, why does the presence of water vapour, without droplets, reduce ...
It is very important NOT to neglect tropopause effects, as Allan indicates. There have been several occasions in the past where I'm sitting in the middle of a...
Ling,Alister [Edm]
alister.ling@...
Aug 29, 2002 3:36 pm
21
This is the way I always explained the effect of moisture to reduce transparency, scattering. Moisture also increase somewhat the extinction. I have to add,...
It is a pleasure to see you joining the group Alister. Regarding cases you mention with upper ridge sitting over alberta, how bad was the seeing when the...
Actually the boundary layer is the last 12 meters to the surface. At least it was the last time I studied micrometeorology. DustyMars ... tropopause. ... me...
We were at the Black Forest Star Party (Cherry Springs State Park, PA.) in the wake of 9/11 (it was held just a few days later, when there were no planes...
Some good stories (articles) on "astronomical seeing" can be found at: http://www.cmc.ec.gc.ca/cmc/htmls/seeing_e.html "How to Predict Seeing," By Eric J....
I can speak only from the limited perspective of an Arizona observer. I'd say that aircraft contrails have no significant effect on sky conditions, at least on...
In the world of meteorology, the boundary layer is usually below 3000 feet (1000 meters). It is the layer where the airmass creates an inversion during the...
No, unless you live nearby Chicago or other major airports where airplane turns around before landing. When there is a lot of moisture at the tropopause, in...
Well, according to the book I usually reference these things from: Descriptive Micrometeorology, by R.E. Munn, Advanced in Geophysics, supplement 1, 1966....
Just a brief answer... glad to be on the list! ... Subject: RE: [AstronomyWeather] Re: Ground effect on "seeing" ... you ... moved ... Oh, it went from 4 (very...
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