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Dr Fisher, 69, said the storm, which will cause Sun to reach temperatures of more than 10,000 F (5500C), occurred only a few times over a person’s life.
Every 22 years the Sun’s magnetic energy cycle peaks while the number of sun spots – or flares – hits a maximum level every 11 years.
Dr Fisher, a Nasa scientist for 20 years, said these two events would combine in 2013 to produce huge levels of radiation.
He said large swathes of the world could face being without power for several months, although he admitted that was unlikely.
A more likely scenario was that large areas, including northern Europe and Britain which have “fragile” power grids, would be without power and access to electronic devices for hours, possibly even days.
He said preparations were similar to those in a hurricane season, where authorities knew a problem was imminent but did not know how serious it would be.
