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Ann. Geophys., 23, 371-378, 2005
www.ann-geophys.net/23/371/2005/
© European Geosciences Union 2005
On the relationship between the velocity of E-region HF echoes and ExB plasma drift
A. V. Koustov1, D. W. Danskin2, R. A. Makarevitch3, and J. D. Gorin1
1Institute of Space and Atmospheric Studies, University of Saskatchewan, 116 Science Place, Saskatoon, S7N 5E2 Canada
2Geological Survey of Canada, Geomagnetic Laboratory, 7 Observatory Cres., Ottawa, K1A 0Y3 Canada
3Department of Communication Systems, Lancaster University, Lancaster, LA1 4YR, UK
Abstract. In this study, velocities of E-region HF echoes observed by the Stokkseyri
HF radar are compared with ExB plasma drifts in the F-region measured by the
DMSP satellites. Events were selected for which the DMSP track projected to the height of 110km
was almost perpendicular to the central beams of the radar, resulting in a
direct comparison of the cross-track component of the ExB drift and the
line-of-sight HF velocity. We found that the typical ratio of HF velocity to
the DMSP drift is ~0.35 in a range of DMSP drifts of 0-1700m/s. It
is suggested that E-region HF velocities, observed both along the electrojet and at large flow angles, are significantly affected by scatter from
the bottom of the electrojet layer where the irregularity phase velocity is
expected to be strongly depressed with respect to the ExB flow.
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