[SQM] Snow Measurements

Tony Flanders tflanders at skyandtelescope.com
Thu May 7 17:32:20 UTC 2009


Fabio,

I just saw your request from Nov. 2008 for measurements with and without snow cover. Here are some measurements using a standard SQM (not SQM-L) pointed at the zenith from Arlington, MA, at 42:24.7N 71:10.5W. This is about 7 miles from the center of Boston, MA. All times are local standard (EST). I recorded the transparency as "very good" in all cases. All measurements are based on 5 consecutive readings, possibly discarding the first reading if it is clearly out of line.

Arlington has full-cutoff street lighting, which exaggerates the effect of snow.

2007/11/16 19:40 18.35+-.02
2007/11/27 20:08 18.21+-.02 -- 84% Moon alt 70, shield moonlight from SQM with hand
2007/12/16 20:40 17.70+-.01 -- 40% Moon alt 26, fresh snow with ice glaze, unusually bright
2008/02/28 20:21 18.08+-.03 - new snow
2008/03/05 20:53 18.46+-.02
2008/12/03 19:19 18.38+-.08 - 32% Moon alt 20
2009/01/03 19:45 17.78+-.04 -- 45% Moon alt 41, extensive snow cover

    - Tony Flanders
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