Historical Auroras in the 990s: Evidence of Great Magnetic Storms
详细信息 查看全文
- 作者：Hisashi Hayakawa ; Harufumi Tamazawa ; Yurina Uchiyama ; Yusuke Ebihara…
- 关键词：Sun ; Extreme space weather events ; Magnetic storm ; Historical documents ; Carbon ; 14 spike
- 刊名：Solar Physics
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：292
- 期：1
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Astrophysics and Astroparticles; Atmospheric Sciences; Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics);
- 出版者：Springer Netherlands
- ISSN：1573-093X
- 卷排序：292
文摘
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 in contemporary observations from the 990s to determine potential auroras. Records of potential red auroras in late 992 and early 993 were found around the world, i.e. in the Korean Peninsula, Saxonian cities in modern Germany, and the Island of Ireland, suggesting the occurrence of an intense geomagnetic storm driven by solar activity.