||International Occultation Timing Association * EuropeanSection *|
Pollution ... a Big Concern >>>>
- Colours correspond to ratios between the artifical sky
and the natural sky brightness of:
<0.11 (black), 0.11-0.33 (blue), 0.33-1 (green), 1-3 (yellow), 3-9 (orange), >9 (red)
- These maps are intended to show the
levels of pollution in the atmosphere rather than the stellar
visibility, but the colour code can give an estimate:
Red: approximately one hundredth of stars, or few more, is visible over 30 degrees of elevation
Orange: the milky way is invisible or quite difficult to see by an average observer in normal clear nights
Yellow: artificial sky brightness equal to the natural so that the total sky brightness is doubled
Blue: artificial sky brightness over 10% than the natural brightness which is the definition of "light polluted sky"
- The maps show the artificial sky brightness at the zenith in clear nights in V band.
Finally I want to thank Odilon Ferreira Junior from Brazil for
software "GPS TrackMaker" ( www.gpstm.com
), which I used for
creating these maps and all the other station maps before.
|Beligum, The Netherlands, Germany|
|Czech Republic, Slovakia|
|Norway, Denmark, Finland|