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inversions near the surface Ducting events over land at polar latitudes and over deserts are almost entirely caused by the dry refractivity variability Midlatitude and tropical events appear at higher altitudes as well, up to 19 km and 23 km, respectively, while all events at higher altitudes are over the sea The mean thickness of the layer over which ducting conditions occur is usually very small for near surface events, about 30 to 50 m Events at higher altitudes show a mean thickness of about 120 m Events near the surface tend to be highly variable, while events at higher altitude show lower variability In the tropics they are more variable than at midlatitudes The mean minimum in the refractivity gradient is lowest for tropical events and increases with altitude Variability in the minimum refractivity gradient is highest near the surface and decreases with altitude
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Propagation through dust and/or sand is less researched and understood than propagation through rain The atmosphere contains a variety of solid particles in suspension; in soil mechanics, particles with radii less than 60 micron are termed dust, depending on their size 6 Particles with radii greater than 60 micron are typically called sand The content of dust and sand will be vastly different in different parts of the world Dust particles are random in shape and cannot be classified as spheres, ellipsoids or otherwise, which complicates their mathematical modeling The larger the size of the particles, the quicker they fall out of suspension While aerosols can remain aloft for days and sometimes years, sand will rapidly descend to the ground once the impelling force, such as a violent wind storm, has subsided In a like manner, aerosols can be carried high up into the stratosphere in even a slight updraft while the larger particles, such as sand, generally remain within a 10 meters of the surface of the Earth Dust can be found up to 5,000 m above ground Aerosols and small solid particles do not significantly affect the transmission of electromagnetic waves until the optical frequencies are approached and their particle s cross-section becomes appreciable The effect of fine dust and coarse dust (sand) on radio wave transmissions can be noticeable at much lower frequencies, however, although the impact is often difficult to separate from the meteorological phenomena that often accompany the dust storms In many cases, the strong winds that generate a dust storm may cause antenna misalignment that will lead to a loss of signal strength that is difficult to distinguish from the attenuating effect of dust particles
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In other cases, enhanced humidity or even rain that might accompany a severe convective activity in an arid region might cause the dust particles to attenuate more strongly than would be the case in a dry atmosphere due to water uptake into the crystal structure of the particles themselves A measurement of severity of a dust storm that is used in meteorology is visibility; needless to say that visibility decreases with increasing intensity of dust in a storm Visibility is related to the mass of dust per cubic meter of air by: C V (28)
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M = mass of dust (kg) V = visibility (km) C, g = constants that depend on the distance from the point of origin of the storm, type of soil, and climatic conditions at the origin The principal criterion applied to defining the occurrence of a dust storm is the visibility that drops below 1 km; with this determining criterion, between 01 and 174 days per year of dust storm activity occur for the various regions of the world where such effects are observed Worldwide research identifies eight distinct dust storm types: planetary winds, cyclogenic, frontal, katabatic winds, haboob, constriction, dust devils, and diurnal winds There are probably a number of additional local phenomena around the world that may or may not fall into one of the categories listed here The eight dust storm types were classified into a range of average wind speeds, maximum gusts, average storm widths, average storm lengths, and effective storm heights In the 1980s, researchers reported that attenuation coefficients from sand particles at microwave frequencies were linearly proportional to frequency and inversely proportional to optical visibility The attenuation coefficients for distributions of identical particles were linearly proportional to particle radius Other theoretical analyses have shown that sand and dust particle attenuation at microwave frequencies tends to be significant at very high particle concentrations (visibilities of less than 20 m), or at high moisture contents, or both Specific attenuation for a visibility of 10 m (30 ft), with high content of water in dust particles, is close to 06 dB/km@30 GHz, and 007 dB/ km@10 GHz It was found that for linear polarization the effect of dust storms is almost negligible except for very dense storms; ie, storms with visibilities of less than a few meters
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