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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 11
Ann. Geophys., 23, 3451–3455, 2005
https://doi.org/10.5194/angeo-23-3451-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 3451–3455, 2005
https://doi.org/10.5194/angeo-23-3451-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  21 Dec 2005

21 Dec 2005

A comparison of satellite scintillation measurements with HF radar backscatter characteristics

S. E. Milan1, S. Basu2, T. K. Yeoman1, and R. E. Sheehan3 S. E. Milan et al.
  • 1Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
  • 2Space Vehicles Directorate, Air Force Research Laboratory, Hanscom Air Force Base, Masachusetts 01731, USA
  • 3Institute for Scientific Research, Boston College, Newton Center, Massachusetts 02467, USA

Abstract. We examine the correspondence between high latitude ionospheric scintillation measurements made at 250MHz with the occurrence of 10MHz HF coherent radar backscatter, on 13 and 14 December 2002. We demonstrate that when the ionospheric intersection point of the scintillation measurements is co-located with significant HF radar backscatter, the observed scintillation, quantified by the S4 index, is elevated. Conversely, when the radar indicates that backscatter is observed away from the intersection point due to movements of the auroral zone, the observed scintillation is low. This suggests that scintillation is highly location-dependent, being enhanced in the auroral zone and being lower at sub-auroral latitudes. The coexistence of scintillation and HF radar backscatter, produced by ionospheric density perturbations with scale sizes of 100s of metres and ~15 m, respectively, suggests that a broad spectrum of density fluctuations is found in the auroral zone.

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