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Author: Publisher: ISBN: Category : Languages : en Pages : 34
Book Description
Microwave radiation is absorbed by atmospheric oxygen and water vapor and is absorbed and scattered by rainfall. The report provides values of these losses in the frequency decade from 10 to 100 GHz for paths through the atmosphere at elevation angles from 0 to 90 degrees. The theoretical expressions for oxygen absorption are assembled in explicit form. The resonant frequencies are taken from published low-pressure measurements, and the entire absorption profile is fitted to published intermediate and atmospheric pressure results, with a constant of proportionality and the absorption resonance line width used as fitting parameters. The absorption line breadth is found to deviate from the accepted linear pressure dependence, increasing approximately as the square root of pressure for pressures above one-half atmospheric. The results of similar analyses of water vapor absorption are assembled and combined with the results of oxygen absorption analyses to obtain the complete absorption coefficients as a function of the atmospheric parameters. The total attenuation due to absorption in the clear atmosphere is computed for a model atmosphere with various water vapor concentrations. Results are provided in graphical form, giving attenuation as a function of frequency and elevation angle. Rough estimates for rain attenuation are made for crude model storms which occur for 1, 0.1, and 0.01 percent of the time. Total values of the attenuation for the model storms and the atmospheric absorption are provided.
Author: Publisher: ISBN: Category : Languages : en Pages : 34
Book Description
Microwave radiation is absorbed by atmospheric oxygen and water vapor and is absorbed and scattered by rainfall. The report provides values of these losses in the frequency decade from 10 to 100 GHz for paths through the atmosphere at elevation angles from 0 to 90 degrees. The theoretical expressions for oxygen absorption are assembled in explicit form. The resonant frequencies are taken from published low-pressure measurements, and the entire absorption profile is fitted to published intermediate and atmospheric pressure results, with a constant of proportionality and the absorption resonance line width used as fitting parameters. The absorption line breadth is found to deviate from the accepted linear pressure dependence, increasing approximately as the square root of pressure for pressures above one-half atmospheric. The results of similar analyses of water vapor absorption are assembled and combined with the results of oxygen absorption analyses to obtain the complete absorption coefficients as a function of the atmospheric parameters. The total attenuation due to absorption in the clear atmosphere is computed for a model atmosphere with various water vapor concentrations. Results are provided in graphical form, giving attenuation as a function of frequency and elevation angle. Rough estimates for rain attenuation are made for crude model storms which occur for 1, 0.1, and 0.01 percent of the time. Total values of the attenuation for the model storms and the atmospheric absorption are provided.
Author: Venkataraman Lakshmi Publisher: John Wiley & Sons ISBN: 1118872266 Category : Science Languages : en Pages : 572
Book Description
Remote Sensing of the Terrestrial Water Cycle is an outcome of the AGU Chapman Conference held in February 2012. This is a comprehensive volume that examines the use of available remote sensing satellite data as well as data from future missions that can be used to expand our knowledge in quantifying the spatial and temporal variations in the terrestrial water cycle. Volume highlights include: An in-depth discussion of the global water cycle Approaches to various problems in climate, weather, hydrology, and agriculture Applications of satellite remote sensing in measuring precipitation, surface water, snow, soil moisture, groundwater, modeling, and data assimilation A description of the use of satellite data for accurately estimating and monitoring the components of the hydrological cycle Discussion of the measurement of multiple geophysical variables and properties over different landscapes on a temporal and a regional scale
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Author: Hans J. Liebe
Author: Naval Research Laboratory (U.S.)
Author: William I. Thompson
Author: United States. Department of Commerce. Office of Telecommunications
Author: 
Author: 
Author: William I. Thompson
Author: Albert W. Biggs
Author: Venkataraman Lakshmi