Extremely rare, black 'anti-auroras' paint luminous 'letter E' above Alaska

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Extremely rare, black 'anti-auroras' paint luminous 'letter E' above Alaska
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Harry is a U.K.-based senior staff writer at Live Science. He studied marine biology at the University of Exeter before training to become a journalist. He covers a wide range of topics including space exploration, planetary science, space weather, climate change, animal behavior, evolution and paleontology.

Extremely rare, black"anti-auroras" helped create a peculiar E-shaped swirl of green light recently photographed over Alaska, experts say.

The unusual aurora is the result of anti-auroras, a.k.a. black auroras. The strange phenomenon creates the rounded dark patches that look as if they have been bitten out from between the arms of the 'E' shape, Spaceweather.com reported. By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over.The swirling light shows normally only occur sparsely near the poles where Earth's magnetic field is weakest. But they are particularly prominent and widespread now due to increased solar activity tied to solar maximum, the peak of the sun's roughly 11-year sunspot cycle.

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