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The Arctic lights of the aurora borealis (the northern lights) are well known for their shimmering green and violet light, but did you know they also emit low frequency electromagnetic (radio) waves? Special devices can convert these natural radio signals into audible whooshing and crackling noises. However, to record these otherwise inaudible vibrations of electric and magnetic energy, you must travel at least four miles away from human sources of sound or electricity that could interfere with the radio receivers.
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