Orientation of the cross-field anisotropy of small-scale ionospheric irregularities and direction of plasma convection
- 1Polar Geophysical Institute of Russian Academy of Sciences, 15 Khalturina, 183 010 Murmansk, Russia
- 2Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada
Abstract. The relationship between the orientation of the small-scale ionospheric irregularity anisotropy in a plane perpendicular to the geomagnetic field and the direction of plasma convection in the F region is investigated. The cross-field anisotropy of irregularities is obtained by fitting theoretical expectations for the amplitude scintillations of satellite radio signals to the actual measurements. Information on plasma convection was provided by the SuperDARN HF radars. Joint satellite/radar observations in both the auroral zone and the polar cap are considered. It is shown that the irregularity cross-field anisotropy agrees quite well with the direction of plasma convection with the best agreement for events with quasi-stationary convection patterns.