Retired physicist Steven McReevy has put online some 'natural radio wave' recordings of the aurora borealis (Northern Lights).
"Unlike sound waves, which are vibrations of air molecules that our ears are sensitive to, natural radio waves as received at ground-level are vibrations of electric and magnetic energy (electromagnetic waves) which--though occurring at the same frequencies as sound--cannot be listened to without an audio-frequency ELF-VLF radio receiver to convert the natural radio signals directly into the same sound frequencies. Another amazing realm of nature is thus ready to be explored and observed."
Here's a sample recorded at Grass River Provincial Park in central-western Manitoba, Canada on 30 August 1996.
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