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Read more about subterranean mapping with ELF/VLF waves. Lightning-ionosphere impacts. Lightning has broader impacts than just the flash of light and thunder. For instance, certain kinds of lightning can cause a brief discharge tens of miles above the cloud, called sprites, which were predicted in the 1920s but not discovered by scientists until 1989. In fact, some lightning can even accelerate electrons to speeds enormously close the speed of light, producing gamma rays that we usually only see in association with collapsing stars and black holes. The Stanford ELF/VLF group is actively engaged in understanding how lightning impacts out planet’s ionosphere and magnetosphere. Read more about studies of sprites and transient luminous phenomena, and terrestrial gamma-ray flashes. How did ELF/VLF Research Come About? The history of ELF/VLF observation dates back to the late 1800’s, when the first telegraph lines were laid down. The first operators reported hearing bizarre sounds that they described as clicks and tweeks, particularly on a day with lightning, which we now know were probably just sferics being picked up by their telegraph line, basically acting like an antenna. Later, in World War I, soldiers operating communication lines reported hearing strange sounds consisting of a falling tone, sounded like someone was whistling. “You can hear the grenades falling” some used to say. What they were really hearing was an indirect version of lightning energy, known today as whistler, coupling into the communication lines. Show Me Some “ELF/VLF Data”, Please. 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. Banka hesabımda elf bloke var mı yok mu öğrenmek için de, şubeye gitmenize gerek yoktur.