Extreme low frequency

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Extreme low frequency (ELF) is a radio wave frequency from 3 to 30 Hz which is extremely popular in conspiracy theories of mind control and weather control. The low frequency waves allow for easier propagation through fluids such as the ocean and are used for submarine communications. ELF generators are also used for studying the ionosphere (such as with HAARP) and as a potential means for over-horizon radar with the Russian woodpecker signal.

Many ELF conspiracies center around fantasies about Nikola Tesla, since he popularized the concept in his attempts to create wireless energy by pumping large amounts of ELF into the ionosphere. Tesla's ideas turned out to be impractical, but his status as a crank martyr has led some to postulate that his devices have been subverted by evil government conspiracies. The mind control properties of ELF are usually attributed to the fact that the "alpha waves" of the brain cycle are within the ELF range. Of course, no physical, rational explanation is given for how ELF generators can use this fact to control thoughts. Weather control is usually attributed to ELF creating "blocks" in the ionosphere, controlling fronts and causing droughts and floods. Known ELF generators such as HAARP are the targets of many conspiracy theories.