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This paper presents a study of five dust storms that occured in Riyadh together with their effect on millimeter-wave propagation. Meteorological parameters are given and airborne-dust's permittivity is estimated using relative humidity data. For large particles, the size distribution and its height dependence are investigated experimentally and the findings are presented as a functional relationship. Based on actual measurements and analysis, attenuation at 37 GHz is calculated using a newly derived expression in terms of optical visibility as a storm parameter. It is found that the fitted probability distributions are best described by normal or lognormal and vary with duststorm conditions. The average effective sizes and the 37-GHz attenuation decreases with the increase of antenna height following a power law.
Geoscience and Remote Sensing, IEEE Transactions on (Volume:GE-25 , Issue: 5 )
Date of Publication: Sept. 1987