Science Advances

The PDF file includes:

• Fig. S1. A context image of the solar flare in active region 12615.
• Fig. S2. Si IV contribution function.
• Fig. S3. A comparison of Si IV 1402.77 Å and Mg II 2796.35 Å centroid positions.
• Fig. S4. Temporal evolution of Si IV 1402.77 Å line properties during the flare (for two individual pixels).

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Other Supplementary Material for this manuscript includes the following:

• Movie S1 (.mp4 format). Light curves and the images and line spectra of flare SOL2016-12-06T10:36:58 at all studied times during the flare rise, peak, and decay (associated with Fig. 1).
• Movie S2 (.mp4 format). Plasma velocity fluctuations in space and time due to the passage of a single wave (associated with Fig. 4).
• Movie S3 (.mp4 format). Plasma velocity fluctuations in space and time due to the passage of multiple interacting waves (associated with Fig. 4).