The only natural phenomena I can link this phenomena to are aurora, or just the solar wind, if you prefer. Can't discount the upswing in the present solar cycle and proliferation of quality recording devices. Sound has been associated with aurora before and not always in "concert" with visual phenomena, historically.
Of course, while most of these phenomena seem to be associated with higher latitudes, they are not exclusive to the northern places, but neither are rapid ionospheric flux measurements exclusive to the auroral rings around the poles.
Moulton Howe covered that in her show. Interviewed some guy from NASA that studies the aurora and he said they do not emit sounds. (But I thought that I had heard that sometimes folks hear things?) And Howe asked about the increase in solar activity. But the NASA guy pointed out that yes, it is an increase from the VERY low activity we have had, but is still quite low. We are still about a year off from the max, and the max is forecast to be the lowest in 100 years. (11 year cycles).
It is too bad that so many of the videos on the net seem to be fakes (or re-recordings with new video). Some of the more interesting ones are with the real newscasters reporting on events. Reports from numerous people of earthquakes in Vancouver; B.C. but with no seismic activity, reporters in the streets with firetrucks responding but not finding anything, etc.
http://www.damninteresting.com/the-sound-of-the-aurora/
So there are “reports” of sounds, but no actual recordings. Interesting topic. But the sounds are more like static and faint - not the loud, low frequency noises people claim to hear and record.
“There are strange things done in the Midnight Sun by the men who muck for gold.”