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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. We’re talking about radio waves, like the AM/FM elf slots casino sister sites signals you get, just at an even lower frequency. 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. Most of the VLF/ELF energy released by lightning is trapped between the Earth and ionosphere, and thus can travel around the world. The second type signal you’ll hear is a falling pitch, lasting a couple seconds, known for this reason as a “whistler”. Whistlers are also comprised of energy released from lightning, except instead of propagating directly, these signals actually escape the atmosphere entirely, propagate along magnetic field lines and within the radiation belts (causing different frequencies to travel at different speeds), and land at the other end, where they reenter the atmosphere. In fact, as Stanford researchers pioneered in the 1970s, injection of VLF signals into the magnetosphere can lead to a variety of physical phenomenon in the magnetosphere, when these waves interact with radiation belt particles. Sadece yeni sites bir kullanıcı hesabı açarak kayıt işlemini tamamlamanız yeterli olur.