A quartet of researchers, three with the University of Reading, the other with the University of Oxford, reports evidence that sending an electric charge into a rain-free cloud could result in the formation of raindrops. In their paper published in Proceedings of the Royal Society, A, M. H. P. Ambaum, T. Auerswald, R. Eaves and R. G. Harrison describe their calculations showing that altering the electrostatic charge in moisture-laden clouds could lead to greater variation in charge, resulting in the formation of raindrops.
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Source: Phys.org