[AZ-Observing] Seeing again
- From: Brian Skiff <Brian.Skiff@xxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Tue, 24 Jun 2003 22:09:09 -0700 (MST)
Tonight the wind dropped not long before sunset:
Time T(F) RH DewP Wind
6 pm 67.3 26% 31.3 11 WSW
7 pm 64.6 27% 29.9 7 WSW
8 pm 59.7 27% 25.8 4 W
9 pm 56.8 30% 25.8 3 W
...and now that it's dark, the naked-eye scintillation is "usual",
i.e. moderate amplitude and speed. Yet the turbulence forecast models...
http://www.rap.ucar.edu/projects/itfa/turbfc1.html
http://www-frd.fsl.noaa.gov/mab/tke/tke_new.cgi
..and the 'Clear Sky Clock' all show northern AZ to have moderate-to-strong
turbulence/poor seeing for at least the first half of the night.
And guess what: the observer at the 72-inch reports "rotten" seeing.
The seing is worse than last night, the very twinkly night that Steve
was complaining about. The 72-inch has 19 _meters_ focal length, so is
pretty sensitive to seeing, but I don't see anything unusual in LONEOS
images (2".5 per pixel), and it looks fine in my little Pronto, which I
happen to have out looking at some red stars.
\Brian
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