777 BC—Death of Pārśva or Pārśvanātha (c. 877–777 BCE), the twenty-third Tirthankara of Jainism. 776 BC—First Olympic Games, according to Diodorus Siculus (of the 1st century BC). The games would continue to 394 AD.

A Miyake event is an observed sharp enhancement of the production of cosmogenic isotopes by cosmic rays.It can be marked by a spike in the concentration of radioactive carbon isotope 14 C in tree rings, as well as 10 Be and 36 Cl in ice cores, which are all independently dated. At present, five significant events are known (7176 BCE, 5259 …

2024年8月23日 · Using a 22-box carbon cycle model and Bayesian statistics, we calculate the radiocarbon production rate during the event that is 3.2–4.8 times higher than the average solar modulation, and...

2021年8月25日 · Extreme solar particle events of 775 CE, 994 CE, and 660 BCE are nearly two orders of magnitude stronger than those observed instrumentally. Because of the large observational gap between directly measured and historical events, it was unclear whether they can be produced by the Sun “normally” or from an unknown phenomenon.

2023年2月26日 · Here, we develop this approach further and present a systematic reconstruction of integral fluences (event-integrated fluxes) for four ESPEs: 994 CE, 775 CE, 660 BCE, and 7176 BCE, using a newly developed method based on a simultaneous fit of the spectral shape to the measured data of all the three CIs.

2022年3月7日 · Here we present two previously unknown 14 C production events recorded in two (7176 BCE) and four (5259 BCE) independent, absolutely dated tree-ring chronologies. The magnitudes of the events...

2020年1月20日 · Annual rings record the intensity of cosmic rays (CRs) that had entered into the Earth’s atmosphere. Several rapid 14 C increases in the past, such as the 775 CE and 994CE 14 C spikes, have been...

2020年5月28日 · Erected by Panamuwa. The Aramaic inscription on the lower torso reads at the beginning "I'm Panamuwa, the son of QRL, the King of Ja'udi, I have erected this statue of Hadad, at my eternal grave". From Gerdshin near Sam'al, …

Signatures of extreme SEP events have been reported in 774/775 CE, 992/993 CE, and ∼660 BCE. Here, we report another rapid increase of 14C concentration in tree rings from California,...