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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 11
Ann. Geophys., 22, 3789–3798, 2004
https://doi.org/10.5194/angeo-22-3789-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: 10th International Workshop on Technical and Scientific Aspects...

Ann. Geophys., 22, 3789–3798, 2004
https://doi.org/10.5194/angeo-22-3789-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  29 Nov 2004

29 Nov 2004

Mid-latitude E-region bulk motions inferred from digital ionosonde and HF radar measurements

G. C. Hussey1, C. Haldoupis2, A. Bourdillon3, J. Delloue4, and J. T. Wiensz1 G. C. Hussey et al.
  • 1Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
  • 2Physics Department, University of Crete, Iraklion, Crete, Greece
  • 3Laboratoire IETR, Université de Rennes 1, Rennes, France
  • 4Université Pierre et Marie Curie, Paris, France

Abstract. In the mid-latitude E-region there is now evidence suggesting that neutral winds play a significant role in driving the local plasma instabilities and electrodynamics inside sporadicE layers. Neutral winds can be inferred from coherent radar backscatter measurements of the range-/azimuth-time-intensity (RTI/ATI) striations of quasi-periodic (QP) echoes, or from radar interferometer/imaging observations. In addition, neutral winds in the E-region can be estimated from angle-of-arrival ionosonde measurements of sporadic-E layers. In the present paper we analyse concurrent ionosonde and HF coherent backscatter observations obtained when a Canadian Advanced Digital Ionosonde (CADI) was operated under a portion of the field-of-view of the Valensole high frequency (HF) radar. The Valensole radar, a mid-latitude radar located in the south of France with a large azimuthal scanning capability of 82° (24° E to 58° W), was used to deduce zonal bulk motions of QP echoing regions using ATI analysis. The CADI was used to measure angle-of-arrival information in two orthogonal horizontal directions and thus derive the motion of sporadic-E patches drifting with the neutral wind. This paper compares the neutral wind drifts of the unstable sporadic-E patches as determined by the two instruments. The CADI measurements show a predominantly westward aligned motion, but the measured zonal drifts are underestimated relative to those observed with the Valensole radar.

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