Hi, forgive me the delay.... here is the information on the research article that pertains to hearing sounds from fireball re-entries. These are called electrophonic sounds. I haven't kept up with the field, so I don't know if there is anything more recent - if there is, I'd like to know about it, thanks. "Progress in Explaining the Mysterious Sounds Produced by Very Large Meteor Fireballs" by Colin S.L. Keay Journal of Scientific Exploration, Vol 7, No 4, pp337-354. 1993 Hope this helps for those that are curious. Good observing, Alister.