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Fig. 9.


Top row: maps for Event (b) constructed by summing the intensities within the spectral window [53 km s−1, 81 km s−1] into the red wing of the O IV 1401 Å line 51 min apart. The left-hand panel clearly depicts the lack of downflow at that time. The contours over-laid on these plots outline regions where the logarithmic electron density inferred from the secondary emission peaks in the red wing of the O IV 1400 Å and O IV 1401 Å lines are above 9.8 cm−3 (blue) and 10.17 cm−3 (pink). Bottom left panel: mean logarithmic electron density (diamonds) for each of the rasters when Event (b) was observable. The vertical lines indicate the standard deviations in each raster. Bottom right panel: parametric study for the relationship between velocity and density as well as the mass flux associated with these super-sonic downflows. From aqua to pink (or bottom to top), the input logarithmic electron density transitions from 9.6 cm−3 to 11 cm−2 in jumps of 0.2 cm−3. The dot-dashed black line corresponds to the mass flux reported by Straus et al. (2015), the solid (dashed) black line correspond to the mean (mean ± one standard deviation) reported in Samanta et al. (2018), and the red dot-dashed line corresponds to the mass flux found for Event (b) here.

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