Yes, a small portable nuclear device can produce an EMP (electromagnetic pulse). These pulses arise from gamma rays emitted during the explosion interacting with Earth's atmosphere, generating high-altitude Compton electrons that create a powerful electromagnetic field .How It WorksHigh-altitude nuclear detonations (above 30 km) maximize EMP via the E1 component, a fast pulse frying unshielded electronics over vast areas—potentially continent-wide from one device. Low-yield suitcase nukes (e.g., 1 kt) detonated at optimal altitudes could still disrupt power grids, vehicles, and comms within tens to hundreds of kilometers GLP
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The Effect of Gamma Rays on Man-in-the-Moon Marigolds