Refractive index effects on the scatter volume location and Doppler velocity estimates of ionospheric HF backscatter echoes

- Ponomarenko, P. V., St-Maurice, J. P., Waters, C. L., Gillies, R. G., Koustov, A. V.

Spectral width of SuperDARN echoes: measurement, use and physical interpretation

- Ponomarenko, P. V., Waters, C. L.