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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 10
Ann. Geophys., 14, 1060–1065, 1996
https://doi.org/10.1007/s00585-996-1060-0
© European Geosciences Union 1996
Ann. Geophys., 14, 1060–1065, 1996
https://doi.org/10.1007/s00585-996-1060-0
© European Geosciences Union 1996

  31 Oct 1996

31 Oct 1996

Study of sporadic-E clouds by backscatter radar

Z. Houminer1, C. J. Russell2, P. L. Dyson2, and J. A. Bennett3 Z. Houminer et al.
  • 1Asher Space Research Institute, Technion, Israel Institute of Technology, Haifa 32000, Israel
  • 2School of Physics, La Trobe University, Bundoora, Victoria 3083, Australia
  • 3Department of Electrical and Computer Systems Engineering, Monash University, Clayton, Victoria 3168, Australia

Abstract. It is shown that swept-frequency backscatter ionograms covering a range of azimuths can be used to study the dynamics of sporadic-E clouds. A simple technique based on analytic ray tracing can be used to simulate the observed narrow traces associated with Es patches. This enables the location and extent of the sporadic-E clouds to be determined. The motion of clouds can then be determined from a time sequence of records. In order to demonstrate the method, results are presented from an initial study of 5 days of backscatter ionograms from the Jindalee Stage B data base obtained during March-April 1990. Usually 2–3 clouds were observed each day, mainly during the evening and up to midnight. The clouds lasted from 1–4 h and extended between 30°–80° in azimuth and 150-800 km in range. The clouds were mostly stationary or drifted generally westward with velocities of up to 80 m s–1. Only one cloud was observed moving eastward.

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