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What is ELF/VLF Research? ELF/VLF stands for Extremely Low Frequency and Very Low Frequency, and refers to the range elf slots casino sister sites 300 Hz to 30 kHz. The history of ELF/VLF research had its start mostly in audio recordings, since ELF and VLF studies fall in the 300 Hz – 30 kHz, the frequencies range the human ear can recognize. Early ELF/VLF researchers would simply play the signal received by an antenna straight through a speaker. Hence, we can listen to the data stream as if it were audio. Here’s a selected segment of data taken from Stanford, California. In this file, listen for three distinct types of sounds. The first and most prevalent is a series of clicks and pops. These signals, called “radio atmospherics” are short bursts of radiation originating from lightning strikes, which could be anywhere in the world. ELF/VLF waves also penetrate into seawater, elf slots casino sister sites which has led to their use over the past several decades for communication with submerged submarines at long distances. The second type signal you’ll hear is a falling pitch, lasting a couple seconds, known for this reason as a “whistler”.