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    Historical Auroras in the 990s: Evidence of Great Magnetic Storms

    A significant carbon-14 enhancement has recently been found in tree rings for the year 994, suggesting an extremely strong and brief cosmic ray flux event. The origin of this particular cosmic ray event has no...

    Hisashi Hayakawa, Harufumi Tamazawa, Yurina Uchiyama, Yusuke Ebihara… in Solar Physics (2016)