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

@article{Hayakawa2016HistoricalAI,
  title={Historical Auroras in the 990s: Evidence of Great Magnetic Storms},
  author={Hisashi Hayakawa and Harufumi Tamazawa and Yuri Uchiyama and Yusuke Ebihara and Hiroko Miyahara and Shunsuke Kosaka and Kiyomi Iwahashi and Hiroaki Isobe},
  journal={Solar Physics},
  year={2016},
  volume={292},
  pages={1-14}
}
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 not been confirmed, but one possibility is that it might be of solar origin. Contemporary historical records of low-latitude auroras can be used as supporting evidence of intense solar activity around that time. We investigate previously reported as well as new records that have been found… 

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