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 elf slots casino sister sites 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. - sites Hayır, oturabilirsiniz.
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However, these transmitter signals act as a diagnostic of the lower ionosphere, since their propagation to long distances is dependent on ionospheric reflection. The bottom right panels shows an example of two of these VLF transmitters tracked at Stanford for a 3-day period. Both the amplitude (top) and phase (bot) of the signal show a clear daily variation, reflecting the drastic changes to the lower ionosphere from daytime to nightime. This is an example of ionospheric remote sensing using VLF transmitter signals. Where Do You Collect ELF/VLF Data? We have receivers all over the world, on all seven continents, for a wide variety of experiments. Our network is always growing and changing as our experiments adapt. Our students scrounge the planet for the best spots to plot down another of our radio antennas. We work with NASA and the United Nations to place our ELF/VLF receivers in developing countries, which not only gives us more data, but provides a science-grade instrument that scientists in developing countries can use to train students in science and jumpstart their own careers. A.tonsillit.
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