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A solar storm headed for Earth isn't a guarantee of auroras.

冲着地球来的太阳风暴并不是极光出现的保证。

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The most powerful known solar storm occurred in 1859, Bogdan said.

伯丹称，有据可查的最强太阳风暴发生在1859年。

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Usually, when a solar storm hits, most of the radiation either hits the outer radiation belt or the plasmaphere.

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Forecasters can predict the speed a solar storm travels and its strength, but the north-south orientation is the wild card.

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Fortunately, many of the concepts and tools needed to mitigate the consequences of solar storm activity for the electrical grid exist today.

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