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arXiv · 1406.7306

Searching Signals in Chinese Ancient Records for the $^{14}$C Increases in AD 774-775 and in AD 992-993

Ya-Ting Chai·Yuan-Chuan Zou
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Abstract

According to the analysis of the $^{14}$C content of two Japanese trees over a period of approximately 3000 years at high time resolution, Miyake (2012) found a rapid increase at AD 774-775 and later on at AD 992-993 (Miyake 2013). This corresponds to a high-energy event happened within one year that input $\gamma$-ray energy about 7$\times{}$10$^{24}$erg to the Earth, leaving the origin a mystery. Such strong event should have an unusual optical counterpart, and have been recorded in historical literature. We searched Chinese historical materials around AD 744-775 and AD 992-993, but no remarkable event was found except a violent thunderstorm in AD 775. However, the possibility of a thunderstorm containing so much energy is still unlikely. We conclude the event caused the $^{14}$C increase is still unclear. This event most probably has no optical counterpart, and short gamma-ray burst, giant flare of a soft gamma-ray repeater and terrestrial $\gamma$-ray flash may all be the candidates.

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Ya-Ting Chai, Yuan-Chuan Zou. 2014-06-26. Searching Signals in Chinese Ancient Records for the $^{14}$C Increases in AD 774-775 and in AD 992-993. https://doi.org/10.1088/1674-4527/15/9/007

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