During the flare of October 28th, the SOLSTICE instrument was fortuitously performing very quick scans of the spectral region around Lyman alpha (121 nm), Silicon III (120 nm) and Magnesium II h & k (280 nm). These four lines are sensitive to changes in the solar atmosphere, and show the effect of the flare on the solar chromosphere. The region near 120 nm was sampled once per minute, while the region near 280 nm was measured every two minutes.
The second plot shows the individual spectral scans over the course of the flare. The dashed line is the pre-flare spectrum for comparison. The timestamp of each scan is shown at the bottom of the plot.