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Ann. Geophys., 26, 1517-1523, 2008
www.ann-geophys.net/26/1517/2008/
© European Geosciences Union 2008
Effects of mixed scatter on SuperDARN convection maps
P. V. Ponomarenko, C. L. Waters, and F. W. Menk
University of Newcastle, Callaghan, NSW, Australia
Abstract. The SuperDARN radars map high-latitude ionospheric plasma drift velocities by
measuring the Doppler frequency shift of HF signals scattered by decameter
electron density irregularities. In many cases the ionospheric returns are
contaminated by strong scatter from the ground or sea surface. In this paper
we develop and test a two-component fitting algorithm to separate ionospheric
and surface scatter components. Application of the technique to sample data
reveals that mixed scatter may considerably distort ionospheric convection
patterns derived from the radar data and can cause underestimation of the
plasma drift velocity.
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