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II The Problem and the approach
Case of a single elevated layer
VII Concluding remarks
Airy function angel echoes angel occurrence antenna approximately assumed assumption Attenuation factor chapter coast of India completely trapped modes depression angle direct backscattering distance duct end duct parameters duct termination duct thickness elevated duct elevated radio duct Field distribution due height gain functions higher order modes homogeneous space India Meteorological Department inhomogeneous half spaces intense inversion layer Massachusetts Bay observations miles minimum detectable signal mode parabolic profile modes considered observed at Bombay observed echoes observed over Massachusetts Offshore angels observed offshore radar angels open end period of angel phase integral phenomenon pulse repetition frequency q dz radar cross section radar energy radiation pattern radio propagation radiosonde received power reflecting layer reflection coefficient refractive index distribution refractive index gradient refractive index profile refractive index variation scattering sea surface shown in figure solution surface duct tens of meters tion track widths tropospheric wave guide wave length weather radar west coast