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 radioactive carbon isotope 14
C in tree rings, meaning the events can be dendrochronologically dated. Given their recent discovery the number of confirmed Miyake events is relatively low (5 or 6 events), hence their periodicity remains unknown. However, some initial models estimate that one such event would take place once in every 400-2400 years.[1] The currently known Miyake events took place around 7176 BCE, 5410 BCE, 5259 BCE, 663 BCE, 774-775 CE and 993-994 CE. According to a study conducted by a University of Queensland team led by astrophysicist Benjamin Pope, some of the events were short-lived, while others lasted for years.[2] A Miyake event occurring in the near future, as interpreted by various scientists, would have significant impacts on global technological infrastructure such as satellites, telecommunications, and power grids.[3][4] [5] [6]

Discovery

The events are named after the Japanese astronomer Fusa Miyake, whose team was the first one to identify these annual radiocarbon spikes and published the results in 2012 in the journal Nature. The investigation at that time found a strong 14
C increase in the annual rings of Japanese cedars for the years 774/775 (see 774–775 carbon-14 spike). In 2013, the same team published the discovery of another, similar radiocarbon spike in the years 993/994 (see 993–994 carbon-14 spike).[7]

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. https://doi.org/10.1038/s41467-022-28804-9
  2. https://doi.org/10.1098/rspa.2022.0497
  3. https://doi.org/10.1038/s41467-022-28804-9
  4. "Ancient tree rings might not record solar flares after all". cosmosmagazine.com. 2022-10-28. Retrieved 2023-03-06.
  5. online, heise. "Rätselhafte Strahlungsausbrüche etwa alle 1000 Jahre: Gefahr für moderne Technik". heise online (in German). Retrieved 2023-03-06.
  6. "Radiocarbon (14C)". www.isee.nagoya-u.ac.jp. Retrieved 2023-03-06.
  7. https://doi.org/10.1038/ncomms2783
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