Fig. 6
NBE 2 simulation. Simulated radiation centroids (circular markers, colored and sized by VHF power) of a vertically propagating point source, having the same VHF amplitudes, altitudes, and speed of NBE 2. Each marker denotes the average angular position of the 128 source solutions in each 0.7-μs window, and error bars denote the standard deviations. a, b Centroid locations without added noise, plotted in elevation vs. azimuth and elevation vs. time, respectively, and c, d same, but with the pre-flash noise of NBE 2 added, showing that the resulting scatter in elevation and azimuth is partially but not fully accounted for by the pre-flash noise
