SABRE observations of E-region vertical velocity structures |
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| Institution: | 1. Royal Meteorological Institute (RMI), Ringlaan 3, Brussels B-1180, Belgium;2. Observatori de l''Ebre (OE), Univ. Ramon Llull – CSIC, Horta Alta 38, 43520 Roquetes, Spain;3. Leibniz-Institute of Atmospheric Physics at the University Rostock, Schlossstr. 6, Kuehlungsborn 18225, Germany;4. Lowell Digisonde International, 175 Cabot Street, Lowell, MA 01854, USA;5. University of Massachusetts Lowell, Space Science Laboratory, Lowell, MA 01854, USA;6. National Observatory of Athens, IAASARS, Metaxa and Vas. Pavlou, Palaia Penteli 15236, Greece;7. Institute of Atmospheric Physics, Czech Academy of Sciences, Bocni II 1401, 141 31 Prague, Czech Republic;1. Department of Electrical Engineering, LACOSER laboratory, University Amar Telidji, Laghouat, 03000, Algeria;2. IRIT, ENSEEIHT, BP 7122, F-31071, Toulouse Cedex, France;1. Environment and Natural Resources, Faculty of Economics, University of Iceland, Gimli, Sæmundargötu 2, 102 Reykjavík, Iceland;1. Department of Physics and Astronomy and IQSCS, University of Leicester, UK;2. School of Business and IQSCS, University of Leicester, UK;3. Department of Molecular and Cell Biology, University of Leicester, UK |
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| Abstract: | The variation of backscatter intensity with slant range for the Wick radar of the SABRE system consistently exhibits a minimum at approximately 800 km. Theoretical modelling of the antenna characteristics indicates that this is due to a null in the vertical polar diagram due to interference from ground reflections (Lloyd's mirror effect). By means of this “null” feature, the vertical velocity distribution within the scattering layer can be examined.A sharp discontinuity often exists in the variation of the Doppler velocity with range across the backscatter minimum. These observations can be accounted for in terms of an increase in the drift velocity of about 200 m s−1 with height across the 10 km range of the scattering layer. These results are consistent with the theoretical predictions of St.-Maurice and Schlegel based on the assumption of a two-stream instability. |
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