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Fig. 2


Occurrence probability of each component of non-Io decameter radio emissions vs. CML and Ganymede’s phase ΦGa. Data are non-Io emission events detected in Nançay between 1990 and 2015. Each component (non-Io-A, -B, -C, and -D) is searched separately for Ganymede-induced emissions. One row of plots is displayed per component. In each row, the left panels show the occurrence probability in the CML − ΦGa plane, within 5° × 5° bins (interpolation at 1° resolution is then applied to smooth the display). The restriction in maximum frequency is explained in the text. The central panels show the occurrence probability vs. ΦGa only (in 5° bins), obtained by integration over all CML. The right panels show the occurrence probability vs. ΦGa obtained byintegration over the CML interval delimited by the white dashed lines on the left panels, and indicated above the right panels. The curve in the latter panel is smoothed over three bins and ordinates are in standard deviations (σ) above the mean (m; m and σ are computed in a robust way iteratively, excluding at each iteration the points xi so that |xim| > 2.5σ). Dotted lines indicate -3σ to +3σ levels by 1σ steps, and by 3σ steps beyond these values. The peak value is indicated above the plot. Detection of Ganymede–D emissions (panels j, k, l) is marginal and therefore uncertain.

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