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You’ll notice a pattern to it – 1,2,3, pause,1,2,3, pause… These are the `Alpha’ navigation beacons operated in Russia, and are an example of a VLF transmitter, which can be used to remotely sense disturbances in the ionosphere. The data are divided up into small time segments, in this case 10 ms long. A Fourier transform is performed on each segment, and the color shows the magnitude of the signal. There are also a set of short horizontal lines between 10 and 15 kHz. These are the `Alpha’ navigation beacons. Where Do You Collect ELF/VLF Data? 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. …