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Type: Journal article
Title: VHF radar observations of cat's-eye-like structures at mesospheric heights
Author: Reid, I.
Ruster, R.
Schmidt, G.
Citation: Nature, 1987; 327(6117):43-45
Publisher: Nature Publishing Group
Issue Date: 1987
ISSN: 0028-0836
Statement of
Iain M. Reid, Rüdiger Rüster & Gerhard Schmidt
Abstract: Observations of noctilucent clouds indicate the frequent occurrence of wave-like motions and Kelvin–Helmholtz billows at the high latitude summer mesospause (~83 km), but to date no other technique appears to have produced direct evidence of their pres-ence at these heights. High-powered mesosphere–stratosphere–troposphere very high frequency Doppler radars with good height and time resolution (~150~300 m and ~10 s respectively) capable of making such observations have recently become available, and the backscattering regions in the mesosphere detected by such radars often take the form of thin layers that appear to be pro-duced by dynamical instabilities in the region of maximum wind shear. Such wind conditions should produce Kelvin–Helmholtz instabilities, and here we present two examples of mesospheric radar observations that suggest the characteristic 'cat's-eye'-like turbulent structures often associated with them in other parts of the atmosphere, the ocean and in laboratory experiments.
Rights: © 1987 Nature Publishing Group
DOI: 10.1038/327043a0
Appears in Collections:Aurora harvest
Physics publications

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