[SQM] your help with the SQM readings for GLOBE at Night is needed!
Fieldsde at aol.com
Fieldsde at aol.com
Sun Jan 4 21:51:36 UTC 2009
In a message dated 3/2/2008 12:46:17 Eastern Standard Time, cwalker at noao.edu
Your help is needed. In the past 6 nights of the GLOBE at Night campaign,
less than 100 Sky Quality Meter measurements worldwide have been submitted.
You are cordially invited to submit your SQM measurements to the GLOBE at
Night program, a light pollution study being conducted worldwide, from now
through March 8 (7-10pm local time, an hour after sunset). Information on the
general site is at www.globe.gov/GaN/. The reporting page for SQM measurements
is at _http://126.96.36.199/gan/2008/report.cfm_
(http://188.8.131.52/gan/2008/report.cfm) . The data, time, latitude, longitude, estimate of cloud cover, SQM
reading and SQM serial number are needed. But also as important, please
select "Cloudy Sky/No Data" if you are not also inputting an unaided-eye
observation (magnitude chart) of Orion.
The National Optical Astronomy Observatory's press release on the GLOBE at
NIght program, a flyer and postcard can be downloaded from the press release
webpage at _http://www.noao.edu/outreach/press/pr08/pr0803.html_
We need to do better in supporting GLOBE at Night. I filed a small fraction
of my readings, but certainly have not filed most of them (from moonless
nights). I'll send more reports. Is there a way to see which I have filed?
I am wanting to use these data to quantify light pollution sources at
several local sites. The SQM quantifies light pollution source emissions convoluted
with sky haze and clouds, and we suffer from all of these phenomena. Trouble
is, I've no independent measure of sky haze or cloudiness -- just ground
level humidity. Do you know of any NASA or NOAA programs from which I might
obtain provide values of these scattering/reflectivity parameters, accurate to
the minute? Or a cheap way to quantify what is happening? Or if anyone has had
success separating the source part from the haze part?
I'd also like to assist Fabio Falchi, who is interested in quantifying
effects of the ground reflectivity (with and without snow) but the sky scattering
changes perceptibly over a time scale of maybe 15 minutes so I don't think
that my raw data is very useful.
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