4-15] 



ATTENUATION IN THE ATMOSPHERE 



229 



Fig. 4-47 



6,000 30,000 100,000 

 FREQUENCY (f) Mc 



Atmospheric Attenuation Due to Water Vapor. 



due to Tolbert and Straiton^^ show general agreement with the oxygen 

 attenuation, but for water vapor the measured values are 2.5 to 4 times the 

 theoretical values. Theissing and Caplan" also found that the water vapor 

 absorption between the peaks was higher than Van Vleck's theoretical curve 

 by a factor 2.7. The reason for this disagreement with the theory is not 

 known. 



^^C. W. Tolbert and A. W. Straiten, "Attenuation and Fluctuation of Millimeter Waves," 

 IRE National Convention Record 5 (1), 12-18 (1957). 



^''H. H. Theissing and P. J. Caplan, "Atmospheric Attenuation of Solar Millimeter Radia- 

 tion," J. App. Phys. 27, 538-543 (1956). 



