Hi, I just want to bring to your attention that many of the recorded “strange sounds from the sky” resemble rather much one other little known sound phenomenon, namely the “singing dunes”. The “sand song” is believed to be caused by mechanical shearing of sand layers (although nobody to my knowledge has checked if also electro-magnetic sound production is involved).
Anyway, listen to these:
Sonic Wonders: Booming sand dunes
Morphodynamics: Loud sand dunes
These are not as loud as the celestial trumpets, but it is reported that some sands sing at almost 110 dB.
regards
Erkki Kauhanen
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