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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 9
Ann. Geophys., 15, 1111–1122, 1997
https://doi.org/10.1007/s00585-997-1111-1
© European Geosciences Union 1997

Special issue: Wind Measurements

Ann. Geophys., 15, 1111–1122, 1997
https://doi.org/10.1007/s00585-997-1111-1
© European Geosciences Union 1997

  30 Sep 1997

30 Sep 1997

Strengths and limitations of MST radar measurements of middle-atmosphere winds

W. K. Hocking W. K. Hocking
  • Department of Physics and Astronomy, University of Western Ontario, Canada

Abstract. Radars have been used successfully for many years to measure atmospheric motions over a wide range of altitudes, from ground level up to heights of several hundred kilometres into the ionosphere. In this paper we particularly wish to concentrate on the accuracy of these measurements for winds in the middle atmosphere (i.e. 10–100-km altitude). We begin by briefly reviewing the literature relating to comparisons between radar methods and other techniques. We demonstrate where the radar data are most and least reliable and then, in parallel with a discussion about the basic principles of the method, discuss why these different regimes have the different accuracies and precisions they do. This discussion is used to highlight the strengths and weaknesses of radar methods. Issues like radar volume, aspect sensitivity, gravity wave effects and scatterer intermittency in producing wind biases, and the degree by which the intermittent generation of scatterers at quasi-random points in space could skew the radar measurements, are all considered. We also investigate the possibility that MF radar techniques can be contaminated by E-region scatter to heights as low as 92–95-km altitude (i.e. up to 8–10 km below the ionospheric peak echo). Within all these comments, however, we also recognize that radar methods still represent powerful techniques which have an important future at all levels of the atmosphere.

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