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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 32, issue 2
Ann. Geophys., 32, 147–156, 2014
https://doi.org/10.5194/angeo-32-147-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 32, 147–156, 2014
https://doi.org/10.5194/angeo-32-147-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 20 Feb 2014

Regular paper | 20 Feb 2014

Variations in the occurrence of SuperDARN F region echoes

M. Ghezelbash1, R. A. D. Fiori2, and A V. Koustov1 M. Ghezelbash et al.
  • 1University of Saskatchewan, Saskatoon, Canada
  • 2Geomagnetic Laboratory, Natural Resources Canada, Ottawa, Canada

Abstract. The occurrence of F region ionospheric echoes observed by a number of SuperDARN HF radars is analyzed statistically in order to infer solar cycle, seasonal, and diurnal trends. The major focus is on Saskatoon radar data for 1994–2012. The distribution of the echo occurrence rate is presented in terms of month of observation and magnetic local time. Clear repetitive patterns are identified during periods of solar maximum and solar minimum. For years near solar maximum, echoes are most frequent near midnight during winter. For years near solar minimum, echoes occur more frequently near noon during winter, near dusk and dawn during equinoxes and near midnight during summer. Similar features are identified for the Hankasalmi and Prince George radars in the northern hemisphere and the Bruny Island TIGER radar in the southern hemisphere. Echo occurrence for the entire SuperDARN network demonstrates patterns similar to patterns in the echo occurrence for the Saskatoon radar and for other radars considered individually. In terms of the solar cycle, the occurrence rate of nightside echoes is shown to increase by a factor of at least 3 toward solar maximum while occurrence of the near-noon echoes does not significantly change with the exception of a clear depression during the declining phase of the solar cycle.

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