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This refractive condition is called trapping (or blackout fading), because the wave is confined to a narrow region of the troposphere The common term for this confinement region is a tropospheric duct or a tropospheric waveguide Trapping is an extension of superrefraction, because the meteorological conditions for both are the same In a discussion of atmospheric ducting conditions on electromagnetic wave propagation, the usual concern is propagation beyond the normal horizon (see Figure 25) To propagate energy within a duct, the angle the electromagnetic system s energy makes with the duct must be small usually less than 1 Thicker ducts, in general, can support trapping for lower frequencies The vertical distribution of refractivity for a given situation must be considered as well as the geometrical relationship of transmitter and receiver to the duct so as to assess the duct s effect at any particular frequency Several meteorological conditions could lead to the creation of ducts If these conditions cause a trapping layer to occur such that the base
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Figure 25 Anomalous propagation: ducting
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of the resultant duct is at the Earth s surface, a surface duct is formed Surface-based ducts occur when the air aloft is exceptionally warm and dry compared with the air at the Earth s surface Several meteorological conditions may lead to the formation of surface-based ducts For example, over the ocean and near land masses, warm, dry continental air may be blown over the cooler water surface such as the Santa Ana of southern California, the Sirocco of the southern Mediterranean, and the Shamal of the Persian Gulf This advection will lead to a temperature inversion at the surface In addition, moisture is added to the air by evaporation, producing a moisture gradient to strengthen the trapping gradient This type of meteorological condition routinely leads to a surface duct created by a surface-based trapping condition Surface-based ducts tend to be on the leeward side of land masses and may occur both during the day or at night In addition, surface-based ducts may extend over the ocean for several hundred kilometers and may be very persistent (lasting for days) Elevated ducts may vary from a few hundred meters above the surface at the eastern part of the tropical oceans to several thousand meters at the western part For example, along the southern California coast, elevated ducts occur an average of 40 percent of the time, with an average top elevation of 600 m Along the coast of Japan, elevated ducts occur an average of 10 percent of the time, with an average top elevation of 1,500 m It should be noted that the meteorological conditions necessary for a surface-based duct are the same as those for an elevated duct Evaporation ducts exist over the ocean, to some degree, almost all of the time The duct height varies from a meter or two in northern latitudes during winter nights to as much as 40 m in equatorial latitudes during summer days On a world average, the evaporation duct height is approximately 13 m The duct strength is also a function of wind velocity For unstable atmospheric conditions, stronger winds generally result in stronger signal strengths (or less propagation loss) than do weaker winds Since the evaporation duct is much weaker than the surface-based duct, its ability to trap energy is highly dependent on frequency Generally, the evaporation duct is only strong enough to affect microwave systems above 3 GHz It is a well known fact that the equatorial regions are most vulnerable to ducts In temperate climates, the probability of formation of ducts is lower The ducting probability follows seasonal variations Conventional techniques used to combat other types of fading, such as increased margins or diversity techniques, have little or no influence on blackout fading The altitude where ducting conditions occur over land is almost always within the lowest 200 m of the atmosphere These ducts are caused by
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