Does anyone have an explanation for these? youtube is filled with videos about them and as many could be fun tricks played by trolls many are also real confirmed in many news media articles heard by witnesses. for example I have heard some physicists explaining them as electromagnetic waves and some uninformed people call them simply HAARP as they think its due to the radioantenna array experiments which I think have nothing to do with any of what it's used for. Also can radiowaves and electromagnetic radiation manifest itself as deep low frequency horns being audible ? I don't think so , what phenomenon would make them do so , and how can even a radiowave become a soundwave all by itself ? I think it can't happen. hope to hear some good arguments about this.