hey guys! this is cool.
i had never heard of this before, but i guess we’ve known about it since the 70s. the sound is created by earth’s magnetic field being hit by charged particles from solar wind. blahblahblah. it’s related to the northern lights.
the ionosphere blocks the radio waves (which are 10,000 times stronger than anything man-made) from hitting earth. without that blessed ionoshpere, all of our radio stations would be overwhelmed.
also… they’ve recently discovered that these radio waves (or akr or auroral kilometric radiation) shoot out from the earth in narrow beams. now that we know this, scientist plan on using this knowledge to detect planets around other stars!
click on that link and listen to the awesome sounds!
also… the earth hums