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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 6
Ann. Geophys., 24, 1591–1608, 2006
https://doi.org/10.5194/angeo-24-1591-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 1591–1608, 2006
https://doi.org/10.5194/angeo-24-1591-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  03 Jul 2006

03 Jul 2006

Observations of high-velocity SAPS-like flows with the King Salmon SuperDARN radar

A. V. Koustov1, R. A. Drayton1, R. A. Makarevich2, K. A. McWilliams1, J.-P. St-Maurice1, T. Kikuchi3, and H. U. Frey4 A. V. Koustov et al.
  • 1Institute of Space and Atmospheric Studies, University of Saskatchewan, 116 Science Place, Saskatoon, S7N 5E2, Canada
  • 2Department of Physics, La Trobe University, Victoria 3086, Australia
  • 3Solar-Terrestrial Environment Laboratory, University of Nagoya, 3-13 Honohara, Toyokawa, Aichi 442, Japan
  • 4Space Sciences Laboratory, University of California, Berkley, CA 94720-7450, USA

Abstract. In this study, a focused investigation of the potential for the King Salmon (KS) SuperDARN HF radar to monitor high-velocity flows near the equatorial edge of the auroral oval is undertaken. Events are presented with line-of-sight velocities as high as 2km/s, observed roughly along the L-shell. Statistically, the enhanced flows are shown to be typical for the dusk sector (16:00–23:00 MLT), and the average velocity in this sector is larger (smaller) for winter (summer) conditions. It is also demonstrated that the high-velocity flows can be very dynamical with more localized enhancements existing for just several minutes. These short-lived enhancements occur when the luminosity at the equatorial edge of the auroral oval suddenly decreases during the substorm recovery phase. The short-lived velocity enhancements can be established because of proton and ion injections into the inner magnetosphere and low conductance of the ionosphere and not because of enhanced tail reconnection. This implies that some KS velocity enhancements have the same origin as subauroral polarization streams (SAPS).

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