[SQM] measure with snow coverage

Fabio Falchi falchi at ngi.it
Thu Dec 25 10:59:21 UTC 2008


Dear All,
I think that now snow is covering most of the landscape in northern Europe and America. Even in Las Vegas!
No one is taking measures?
Merry Christmas!
Fabio Falchi
  ----- Original Message ----- 
  From: Fabio Falchi 
  To:  
  Sent: Tuesday, November 25, 2008 5:57 PM
  Subject: [SQM] measure with snow coverage


        Dear friends,
        one of the most discussed issue in light pollution is the direct vs. indirect light in producing sky glow.
        In order to understand better this, I need a number of measures taken with and without snow coverage in the 100 km surrounding the site. Sites far from sources will be affected less by the indirect light while sites near cities or inside cities will be more affected by tha indirect.
        With the SQM reading I'll need also:
        - the transparency of the night (at least in a qualitative way: extremely clear, very clear);
        - the snow coverage at the moment of the measure: for example, main streets (10% of total) clean but sidewalks and surrounding covered, secondary streets half covered, countryside and roofs covered. All in a radius of 80 km. Other example: all streets clean, sidewalks still half covered, surrounding in the country covered.
        Probably some of you already have several measures taken in the same site with and without snow. Who would help me in this field can contact me directly or in this list.
        Fabio Falchi


       




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