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The solar storm in September 1859 is the biggest one on record. It short-circuited telegraph wires across Europe and North America giving electric shocks to telegraph operators and starting fires.

The Aurora Borealis, the Northern Lights, caused by that solar storm was visible in Rome. It is normally only seen close to the Arctic Circle.

Another solar storm in 1989 knocked Quebec's whole power system offline and caused billions of dollars damage. Another in 1994 disrupted communication satellites and TV and radio broadcasts worldwide. The next cycle of solar storms is due at the end of 2012.

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15y ago

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