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|Title:||Atmospheric Emission Measurements at 18 & 22.235 GHz|
Uppal, G S
|Abstract:||Attenuations encountered on clear, cloudy and rainy days over New Delhi were studied using the microwave radiometer designed and developed at the laboratory. Clear day attenuations obtained using observed aerial temperatures at 18 and 22.235 GHz are 0'20 and 1'2 dB, respectively, These are for integrated water vapour content 4'954 X 104 gm/m2 obtained from radiosonde. The cloud attenuation at zenith caused by cumulus clouds was found to be 1'4 and 2'0 dB at 18 and 22.235 GHz, respectively. Simultaneous measurement of attenuations during periods of rain was highly correlated at the two frequencies, but of greater magnitude at 22.235 GHz by a factor of about 1'5. The equivalent path length is 2'7 km at zenith for a surface rainfall rate of 50 mm/hr and compares well with CCIR results. The results at 18 and 22.235 GHz on cloud and rain attenuation along with clear day attenuation at 22.235 GHz on the basis of an analysis of the data collected during a period of 1 yr are also presented.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.08(5&6) [October & December 1979]|
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