Hi all, In the audio world, there is a type of interference called "comb filtering" and it analogous to the interference patterns one sees in light when it is passed over the edge of something sharp like a razor blade (called diffraction ^^^). could this be what is being seen? Well stupendous man showed us that that ain't the case.


Maybe the reference to Infrasound means frequencies less than 20 hz and these frequencies incidentally have a wave length at 1 atm that is between 340 meters (1 hz) and 17 meters (20 hz)

are these shadows this size? ^^^^ I have never seen one.

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