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Downward radiation<br />
density in the<br />
atmosphere above a<br />
line at constant latitude<br />
in function of the<br />
volume index number<br />
and the position.<br />
Light flux scattered<br />
downward by an unit<br />
volume of atmosphere<br />
in function of the<br />
volume index number<br />
and the distance from<br />
an unit source.<br />
Tomography of light pollution<br />
LPTRAN/LPDART Preliminary Data © Cinzano/ISTIL 2004<br />
volume<br />
30<br />
20<br />
10<br />
Lat. N46 ◦ 26’, Veneto, Italy<br />
20 40 60 80 100 120<br />
distance (km)<br />
-1200 -1000 -800 -600 -400<br />
log(s)*100<br />
Tb/km 3<br />
The natural<br />
luminous density<br />
is approximately<br />
of the order of<br />
3·10 −3 Tb/km 3
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