That is weird…Have you come up with a map pinning all the various reports…?
It might be interesting too compare these reports against the BATSRUS Y – Cut Magnetic Field Lines Map (( https://iswa.ccmc.gsfc.nasa.gov/IswaSystemWebApp/ ))
or the Ionosphere Map (( http://wdc.nict.go.jp/x-ray/now/now-12-M.gif ))
or the Heliplots Chart (( https://earthquake.usgs.gov/monitoring/operations/heliplot.php ))
I am sure there are others too check these noises against, but these are just a few that come right into mind…It might be interesting if any thing lines up…Maybe nothing…Just a thought…