ANALYSIS ON CHARACTERISTICS OF ATMOSPHERIC DUCT AND ITS EFFECTS ON THE PROPAGATION OF ELECTROMAGNETIC WAVE* |
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| Authors: | YAO Zhanyu ZHAO Bolin LI Wanbiao ZHU Yuanjing DU Jinlin and DAI Fushan |
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| Institution: | Department of Geophysics, Peking University, Beijing 100871;Department of Geophysics, Peking University, Beijing 100871;Department of Geophysics, Peking University, Beijing 100871;Department of Geophysics, Peking University, Beijing 100871;Department of Geophysics, Peking University, Beijing 100871;Beijing Institute of Applied Meteorology, Beijing 100029 |
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| Abstract: | On the basis of introducing the basic categories of atmospheric refraction and their existing conditions,the forming processes of three kinds of atmospheric ducts are expounded.Several main characteristics of atmospheric duct are summarized and analyzed,and field sounding data from the WEstern North-Pacific cloud-radiation EXperiment(WENPEX) and meteorological data around the Xisha sea area are used to validate these characteristics.Meanwhile the sensitivities of the evaporation duct height to the variations of atmospheric humidity.the air-sea temperature difference.and horizontal wind speed are examined.With the analysis of the effect of atmosphericduct on the propagation of electromagnetic wave.the maximum trapped-wavelength and the critical emitting angle of elevation for electromagnetic wave which can form duct propagation are derived.At the same time the four kinds of necessary conditions for electromagnetic wave to form ductpropagation are brought forward.The effects of atmospheric duct on ultrashort wave propagation,radar observation.short wave communication etc.are also discussed. |
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| Keywords: | atmospheric duct characteristic analysis propagation of electromagnetic wave |
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