Fig. 8.
Hα line profile changes from the pre-flare (BJD 2458502.135) to the peak times of flare C (BJD 2458502.177; lower) and D (BJD 2458502.227; upper). Solid lines (red) indicate the observed line profile changes. Dashed lines (black) represent a Gaussian fit assuming the line-of-sight velocity of 0 km s−1 to the red part (>0 km s−1) of the observed line profile changes. Dotted lines (blue) indicate residuals between the observed line profile changes and the Gaussian fits (thin-dashed lines). Black dash–dotted lines represent a Gaussian fit to the residuals (blue dotted lines). The line-of-sight velocity of the residual component (blue enhancement) at the peak time of flare C is −85 ± 3 km s−1. (Color online)
