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These are the `Alpha’ navigation beacons. The solid horizontal lines between 18 and 30 kHz are VLF transmitter signals, although they are too high in frequency to hear in the audio. These transmitter signals are nominally used for communications. We’re talking about radio waves, like the elf slots casino sister sites AM/FM signals you get, just at an even lower frequency. 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.