[AZ-Observing] Re: Seeing Conditions During Monsoon
- From: "Derrick Lim" <antaresv@xxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Mon, 23 Jul 2007 22:46:28 -0700
Hello AJ!
That's a very interesting study. The results say that the turbulence cells
dictate the local seeing conditions. Therefore something I neglected in the
list is the size of the turbulence cells, how would they distribute over the
Phoenix area, or perhaps more generally, what affects the size of these
turbulence cells? Can anyone please help explain this? Does this have
anything to do with cooler air in the upper atmosphere "shearing" off layers
of warmer air in the lower atmosphere? (or am I way off the track here?) If
so, perhaps wind speed would be a factor in determining the cell size, then
maybe there's a threshold wind speed in the upper atmosphere that can be one
gauge of seeing conditions.
Hope I'm not beating a dead horse here... :)
Derrick
On 7/23/07, AJ Crayon <acrayon@xxxxxxx> wrote:
>
> Something similar to what Derrick suggests was done on the evening of July
> 2, 1989. Six observers, myself and Steve Coe included, lined up at the
> same
> site to watch Saturn occult the star 28 Sagittarii. We watched this event
> for about one hour and each described the view - out loud for all to hear.
> We were set up in a line about 15' to 20' apart. One of the important
> reports turned out that the seeing effects came and went independent of
> telescope observer. That is, while one observer reported seeing so bad
> Cassini's Division wasn't visible. At the same instant another observer
> saw
> the rings crystal clear.
>
> What we decided was that the cells of warmer air, causing the turbulence,
> were much smaller than realized. Perhaps as small as a foot.
>
> Clear skies,
> aj
>
>
>
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