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Infrasonic waves in the atmosphere would move at the speed of sound, which would be something like 400m/s. Shadow bands move at wind speed, so they can be anything from stationary to a few metres [sic] per second."
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Yes, but a standing wave could bee seen to not be moving or moving very slowly if the modulation is constant. if the frequency bands are constructed with multiple frequencies, it could very easily appear to move forward and backwards and even stand still.
What would cause standing waves in the atmosphere is another question though.
fascinating....