electrophonic sounds as have been quite commonly reported from historical meteor fireball events - (Such electrophonic sounds are experienced as weird "pings" and "whees" of low volume intensity and are not fully understood at this time, but are believed to be due to hertzian E/M waves produced in the bolide plasma trail and propagated at the speed of light to the observer - in advance of the bolide. These E/M waves are thought to harmonically couple with the inner ear, or to cause nearby objects to vibrate sympathetically thus producing the observed low volume sounds).