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Higher than normal activity from the sun changing atmospheric conditions. When you see the aurora down this far and a lot farther south you know something is going on........

Depending on the frequency you could have a harmonic that just happens to match up with your equipment and voila', you have sound coming out of your speakers. I have also heard 6 foot tall glass tubes talking as well but that's a different story. ;-) FCC will go after them and they take a dim...