Miyake event

A Miyake event is a powerful burst of cosmic rays. The origin and cause of these increases in cosmic ray activity is currently unknown. The outbreaks are marked in particular by the increase in the carbon isotope C14 in tree rings, meaning the events can be dendrochronologically dated. The events take place roughly every 1000 years on average. The last such events took place around 7176 BCE, 5410 BCE, 5259 BCE, 663 BCE, 774 CE and around 993 CE. According to studies by Australian physicist Benjamin Pope, some of the events were short-lived, while others lasted for years. According to Pope, a Miyake event occurring in the near future would have significant impacts on global infrastructure such as satellites, internet cables, and power grids.[1] [2] [3]

Discovery

The events are named after the Japanese astronomer Fusa Miyake, who published the first results of such radiation bursts in 2012 in the journal Nature. The investigation at that time found a strong C14 increase in the annual rings of Japanese cedars for the years 774/775 (see 774–775 carbon-14 spike).

Bibliography
  • Fusa Miyake, Kentaro Nagaya, Kimiaki Masuda, Toshio Nakamura: A signature of cosmic-ray increase in ad 774-775 from tree rings in Japan. In: Nature 486 (2012), pp. 240-242.
  • Qingyuan Zhang, Utkarsh Sharma, Jordan A. Dennis et al.: Modeling cosmic radiation events in the tree-ring radiocarbon record. In: Proceedings of the Royal Society Vol. 478, No. 2266 (October 2022), doi : 10.1098/rspa.2022.0497 .

References
  1. "Ancient tree rings might not record solar flares after all". cosmosmagazine.com. 2022-10-28. Retrieved 2023-03-06.
  2. online, heise. "Rätselhafte Strahlungsausbrüche etwa alle 1000 Jahre: Gefahr für moderne Technik". heise online (in German). Retrieved 2023-03-06.
  3. "Radiocarbon (14C)". www.isee.nagoya-u.ac.jp. Retrieved 2023-03-06.
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