Full-correlation analysis of turbulent scattering layers in the mesosphere observed by the MU radar |
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| Authors: | Mamoru Yamamoto Toru Sato Toshitaka Tsuda Shoichiro Fukao Susumu Kato |
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| Institution: | (1) Radio Atmospheric Science Center, Kyoto University, 611 Uji, Kyoto, Japan |
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| Abstract: | We have applied a full-correlation analysis technique to the echo power fluctuations observed by the MU radar (35°N, 136°E), and analyzed the horizontal structure of the scattering pattern in the mesosphere as well as their horizontal motions. The velocity of the scattering pattern did not agree with the background wind velocity, but was associated with the horizontal propagating direction of a saturated inertia gravity wave identified in the wind field. The length of the long axis of the characteristic ellipse of the scattering pattern was approximately 50 km, and the direction was almost perpendicular to the propagating direction of the wave. The correlation time of the scattering pattern was approximately 700 s, which is much longer than the lifetime of the isolated turbulence itself. This implies that the observed scattering pattern is associated with a region where the saturated inertia gravity wave generates turbulence. |
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| Keywords: | MU radar mesosphere turbulence scattering layer full-correlation analysis technique gravity wave wave breaking |
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