Letter to the editor Complete maps of the aspect sensitivity of VHF atmospheric radar echoes |
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| Authors: | R M Worthington R D Palmer S Fukao |
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| Institution: | (1) Department of Physics, University of Wales, Aberystwyth, Wales, UK;(2) Department of Electrical Engineering, Center for Electro-Optics, University of Nebraska, Lincoln, USA;(3) Radio Atmospheric Science Center, Kyoto University, Kyoto, Japan |
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| Abstract: | Using the MU radar at Shigaraki, Japan (34.85°N, 136.10°E), we measure the power distribution pattern of VHF radar echoes from the mid-troposphere. The large number of radar beam-pointing directions (320) allows the mapping of echo power from 0° to 40° from zenith, and also the dependence on azimuth, which has not been achieved before at VHF wavelengths. The results show how vertical shear of the horizontal wind is associated with a definite skewing of the VHF echo power distribution, for beam angles as far as 30° or more from zenith, so that aspect sensitivity cannot be assumed negligible at any beam-pointing angle that most existing VHF radars are able to use. Consequently, the use of VHF echo power to calculate intensity of atmospheric turbulence, which assumes only isotropic backscatter at large beam zenith angles, will sometimes not be valid. |
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| Keywords: | Meteorology and atmospheric dynamics (middle atmosphere dynamics turbulence instruments and techniques) |
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