I've been monitoring SIDs along with VE3EAR recently and had nothing to show for it until 2154Z last night (081522). A second event occurred later around 0012Z (081622). NAA dropped a couple dB while NPM rose a couple dB and NML4 rose about 5 dB in the first event. In the second event NAA was steady but both NML4 and NPM rose a couple dB. I can't tell what if anything I detected for the events you reported because the attached graph has no date stamp and the time scale isn't clear (probably Z but not stated). I do see a big sky wave/ground wave null from NPM around 1515Z today, as does VE3EAR, implying the date for the graph might be 081622. But NML4 was off the air then and didn't key up with MSK until nearly 2300Z.
GOES xray data at https://www.swpc.noaa.gov/products/goes-x-ray-flux shows a single large peak around 2121Z and double peaks around 1330 and 1400Z. The NAA receiver at Barnsboro, KY (http://moondog.astro.louisville.edu/) shows a small voltage peak around 2130Z, a rise of about 1.5 dB, not noticed here. Too bad NML4 was OTA then since that would have been my best chance to see a shift in received power.
I receive with a pair of eprobes separated about 100' simultaneously to sdr-iq receivers with Spectrum Lab watch list samples taken at 30 second intervals.
73, Garry, K3SIW, EN52ta, Elgin, IL