Fig. 22From: Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radarsClassification of LOS Doppler velocities from beam-7 of the Blackstone radar on 15 January 2010 according to a the traditional point-by-point threshold method (top) and b the new clustering method (bottom). Ionospheric scatter is colored according to the scale at right while ground scatter is shaded gray. Reproduced from Fig. 3 of Ribeiro et al. (2011)Back to article page