BACK TO INDEX BACK TO OTHMAR FREY'S HOMEPAGE Publications of year 1953 Articles in journal or book chapters

Abstract:  Recent improvements in microwave techniques have resulted in precise measurements which indicate that the conventional constants K1 = 79 K/mb and K2' =4,800 K in the expression for the refractivity of air, N=(n1) 10^6 = [K1/T](p+ K2'(e/T)] should be revised. Various laboratories appear to have arrived at this conclusion independently. In much of radio propagation work the absolute value of the refractive index of the atmosphere is of small moment. However, in some work it is important and it seems highly desirable to decide upon a particular set of constants. Through consideration of the various recent experiments this paper arrives at a relation 77.6 e N = ~ p + 4,810T T where p=total pressure in millibars e=partial pressure of water vapor in millibars T=absolute temperature= (degree C + 273). This expression is considered to be good to 0.5 per cent in N for frequencies up to 30,000 mc and normally encountered ranges of temperatures, pressure and humidity. 
@Article{smithWeintraub1953AtmosphericRefractiveIndex, author = {Smith, E.K. and Weintraub, S.}, title = {The Constants in the Equation for Atmospheric Refractive Index at Radio Frequencies}, journal = {Proceedings of the IRE}, year = {1953}, volume = {41}, number = {8}, pages = {10351037}, month = aug, issn = {00968390}, abstract = {Recent improvements in microwave techniques have resulted in precise measurements which indicate that the conventional constants K1 = 79 K/mb and K2' =4,800 K in the expression for the refractivity of air, N=(n1) 10^6 = [K1/T](p+ K2'(e/T)] should be revised. Various laboratories appear to have arrived at this conclusion independently. In much of radio propagation work the absolute value of the refractive index of the atmosphere is of small moment. However, in some work it is important and it seems highly desirable to decide upon a particular set of constants. Through consideration of the various recent experiments this paper arrives at a relation 77.6 e N = ~ p + 4,810T T where p=total pressure in millibars e=partial pressure of water vapor in millibars T=absolute temperature= (degree C + 273). This expression is considered to be good to 0.5 per cent in N for frequencies up to 30,000 mc and normally encountered ranges of temperatures, pressure and humidity.}, doi = {10.1109/JRPROC.1953.274297}, file = {:smithWeintraub1953AtmosphericRefractiveIndex.pdf:PDF}, keywords = {Atmosphere;Atmospheric measurements;Equations;Humidity;Microwave measurements;Microwave theory and techniques;Radio frequency;Radio propagation;Refractive index;Temperature distribution}, pdf = {../../../docs/smithWeintraub1953AtmosphericRefractiveIndex.pdf}, }
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