478 Table 160 (concluded) 



HORIZONTAL VISIBILITY 



Table 160-C2. — Visual range of point sources of light 

 Function (oD + 2 log, D) 



y; sua l Extinction coefficient, a, km. -1 



ra D ge 10 15 20 30 40 50 100 500 1000 



km. 



0.004 -9.043 -7.043 



0.005 -8.097 -5.597 



0.006 -9.992 -9.932 -9.632 -7.232 -4.232 



0.007 —9.924 -9.854 -9.819 -9.784 -9.714 -9.644 -9.574 -9.224 -6.424 -2.924 



0.008 -9.657 -9.577 -9.537 -9.497 -9.417 -9.337 -9.257 -8.857 -5.657 -1.657 



0.009 -9.421 -9.331 -9.286 -9.241 -9.151 -9.061 -8.971 -8.521 -4.921 -0.421 



0.01 -9.210 -9.110 -9.060 -9.010 -8.910 -8.810 -8.710 -8.210 -4.210 0.790 



0.02 -7.824 -7.624 -7.524 -7.424 -7.224 -7.024 -6.824 -5.824 2.176 12.176 



0.03 -7.013 -6.713 -6.563 -6.413 -6.113 -5.813 -5.513 -4.013 7.987 22.987 



0.04 -6.438 -6.038 -5.838 -5.638 -5.238 -4.838 -4.438 -2.438 13.562 33.562 



0.05 -5.991 -5.491 -5.241 -4.991 -4.491 -3.991 -3.491 -0.991 19.009 44.009 



0.06 -5.627 -5.027 -4.727 -4.427 -3.827 -3.227 -2.627 0.373 24.373 54.373 



0.07 -5.319 -4.619 -4.269 -3.919 -3.219 -2.519 -1.819 1.681 29.681 64.681 



0.08 -5.051 -4.251 -3.851 -3.451 -2.651 -1.851 -1.051 2.949 34.949 



0.09 -4.816 -3.916 -3.466 -3.016 -2.116 -1.216 -0.316 4.184 40.184 



0.1 -4.605 -3.605 -3.105 -2.605 -1.605 -0.605 0.395 5.395 45.395 



0.2 -3.219 -1.219 -0.219 0.781 2.781 4.781 6.781 16.781 96.781 



0.3 -2.408 0.592 2.092 3.592 6.592 9.592 12.592 27.592 



0.4 -1.833 2.167 4.167 6.167 10.167 14.167 18.167 38.167 



0.5 -1.386 3.614 6.114 8.614 13.614 18.614 23.614 48.614 



0.6 -1.022 4.978 7.978 10.978 16.978 22.978 28.978 58.978 



0.7 -0.713 6.287 9.787 13.287 20.287 27.287 34.287 



0.8 -0.446 7.554 11.554 15.554 23.554 31.554 



0.9 -0.211 8.789 13.289 17.789 26.789 35.789 



1.0 0.000 10.000 15.000 20.000 30.000 



1.1 0.191 11.191 16.691 22.191 33.191 



1.2 0.365 12.365 18.365 24.365 36.365 



1.3 0.525 13.525 20.025 26.525 39.525 



1.4 0.673 14.673 21.673 28.673 42.673 



1.5 0.811 15.811 23.311 30.811 



1.6 0.940 16.940 24.940 32.940 



1.7 1.061 18.061 26.561 35.061 



1.8 1.176 19.176 28.176 37.176 



1.9 1.284 20.284 29.784 39.284 



2.0 1.386 21.386 31.386 



2.1 1.484 22.484 32.984 



2.2 1.577 23.577 34.577 



2.3 1.666 24.666 36.166 



2.4 1.751 25.751 37.751 



2.5 1.833 26.833 39.333 



2.6 1.911 27.911 40.911 



2.7 1.986 28.986 42.486 



2.8 2.059 30.059 



2.9 2.129 31.129 

 3.0 2.197 32.197 



32 2.326 34.326 



3.4 2.448 36.448 



3.6 2.562 38.562 



3.8 2.670 40.670 



4.0 2.773 42.773 



SMITHSONIAN METEOROLOGICAL TABLES 



