Physics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..819m&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 50, Sept. 1988, p. 819-829.
Physics
14
Gravity Waves, Mesosphere, Radio Echoes, Radio Scattering, Backscattering, Fresnel Diffraction, Stratosphere, Very High Frequencies, Wind Velocity
Scientific paper
Mesospheric backscattered VHF echo power and wind velocity data indicating the coexistence of a threefold strongly echoing layer and a wave motion were obtained on September 20, 1985, with the MU radar at Shigaraki, Japan. The echoing layers are clearly connected with the vertical and a horizontal wind perturbations due to the wave. The analysis of the wind data shows that the wave motion is due to an internal inertia-gravity wave with vertical and horizontal wavelengths of 6 and 400 km, respectively, and period of 5.6 h. Evaluating the atmospheric stability in the wave field with the estimated wave parameters, the echoing layers are shown to be consistent with statically stable regions generated by the wave. It is suggested from the results that Fresnel scattering is a dominant echoing mechanism for a VHF radar beam in the mesosphere as well as in the lower stratosphere.
Kawahira Kohji
Muraoka Yoshikazu
Sato Toru
Sugiyama Takuya
Tsuda Toshitaka
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