Lightning does this all the time, but we haven’t mastered it yet because to make ELF/VLF waves with an antenna, you need an antenna comparable to a wavelength. Unfortunately, a 3 kHz have has a 100 km wavelength! The Stanford ELF/VLF group is exploring an alternative method of ELF/VLF wave generation, which utilizes the same currents that make the northern lights, to turn the upper atmosphere into a big radiating antenna. Read about our HAARP program work in Alaska. Lightning geolocation. Lightning causes $10B of damage every year (in the USA), kills hundreds worldwide, poses a danger to air traffic, and scares the heck out of you when you’re driving. Understanding the physics of lightning requires advanced simulations. Lightning activity is also expected to go up a lot if global temperature continues to rise. Electric fields associated with lightning and quite difficult to measure, because this would involve putting instruments in the middle of a turbulent thundercloud, so we look at clever elf slots casino sister sites ways to remotely sense these fields.
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On our planet, the most potent source of ELF/VLF waves is lightning, so a lot of what we do comes down to studying lightning and its various impacts on our Earth’s environment, detectable even in Antarctica. Why are ELF/VLF Waves Useful for Engineers and Scientists? ELF/VLF waves are useful scientifically because they largely reflect at the D region of the Earth’s ionosphere (60-90 km altitude), and are thus efficiently guided in the Earth-ionosphere waveguide to global distances. For instance, if you set up a radio receiver just about anywhere on Earth, you can pick up short bits of radiation from lightning strikes literally halfway around the world. These are called radio atmospherics, or sferics. ELF/VLF waves also penetrate into seawater, which has led to their use over the past several decades for communication with submerged submarines at long distances. From a elf slots casino sister sites scientific perspective, though, the reflectivity of the D region at these frequencies make ELF/VLF a unique tool for remote sensing of the D region, which responds to a variety of inputs like solar activity, lightning energy, electron precipitation from the radiation belts, cosmic gamma-rays, and earthquakes. Native lights casino.
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. The top right panel shows a zoom-in of a transmitter called NWC, in Australia, which is clearly detected at Stanford, and the communication signal can be seen as up and down modulation of the 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.
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