Historical Auroras in the 990s: Evidence of Great Magnetic Storms
Hisashi Hayakawa|Harufumi Tamazawa|Yurina Uchiyama|Yusuke Ebihara|Hiroko Miyahara|Shunsuke Kosaka|Kiyomi Iwahashi|Hiroaki Isobe
Recently, a significant carbon-14 enhancement in the year 994 tree rings has been found, suggesting an extremely large cosmic ray flux event during short period. The origin of this particular not confirmed, but one possibility is that it solar origin. Contemporary historical records low latitude auroras can be used as supporting evidence for intense activity around time. We investigated previously reported well new found contemporary observations from 990s to determine potential auroras. Records red late 992 and early 993 were world, i.e. Korean Peninsula, Germany, Island Ireland, occurrence geomagnetic storm driven by activity.
Solar Physics|arXiv (Cornell University)