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Physics

Most powerful thunderstorm ever measured produced 1.3 billion volts

By Chelsea Whyte

20 March 2019

A thunderstorm

Thunderstorms can produce billions of volts

Enrique Díaz/7cero/Getty

A thunderstorm in India produced an electric potential of 1.3 billion volts – 10 times the highest voltage previously recorded. The finding could help explain how high-energy gamma rays are produced during storms.

Inside a thundercloud, positively charged water droplets are carried upward while negatively charged hail pellets are drawn down. This difference in charge between the top and the bottom of the cloud creates a vertical electric field that intensifies as the cloud gets larger. In thunderclouds that are several kilometres thick, the electric potential can reach billions of volts.

That…

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