The transient electromagnetic field generated in space by a nuclear explosion is a nuclear electromagnetic pulse. Nuclear EMP is hundreds of times greater than the electromagnetic field strength of lightning. Wide frequency, including almost all long and short waves, a wide range of hazards, covering a radius of up to hundreds to thousands of kilometers, the greatest threat to wireless communications.July 8, 1962, the United States in the air 400 kilometers above the island of Johnston to carry out nuclear tests, the result is more than 1,300 kilometers away from the heart of the storm on the island of Hawaii, several hundred burglar alarm bells ringing by mistake, dozens of streets street lamps fail, short-wave communications interruptions, the radar screen highlights malfunctions, power supply system fuses blew, electrical components burned out, insulation was broken, electronic system storage washed out, program confusion, wireless control equipment down, alarm message control failure. All of the above are also hazards of nuclear EMP that residents can perceive in their lives. In the early stages of future wars, the enemy may take high-altitude nuclear explosions, in the case of causing fewer casualties, serious damage to the attacked party's electrical communication equipment function, resulting in information confusion, therefore, residents of the anti-EMP to have enough psychological preparation. The author believes that the earthquake will not occur when the electronic pulse
But in 1958, the U.S. atomic weapons experts in the Pacific Ocean over the hydrogen bomb explosion test. The explosion, the instantaneous release of a large number of electronic pulses, which caused an amazing "electronic tsunami", so that hundreds of kilometers in the vicinity of the telecommunication equipment all paralyzed. Street lights on the streets of Hawaii went out, the sea radio communications were interrupted for a full 18 hours, even as far away as Australia's ship communications have been affected. Since then, military experts have realized the destructive power of electronic pulses.