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The 774–775 carbon-14 spike is an observed increase of around 1.2% in the concentration of the radioactive carbon-14 isotope in tree rings dated to 774 or 775 CE, which is about 20 times higher than the normal year-to-year variation of radiocarbon in the atmosphere.
The first half of Fig. 1 shows a grand solar minimum from AD 650 to 720 (Miyake, F., Masuda, K. and Nakamura, T. manuscript in preparation) and a rapid increase of 14C content from AD 774 to 775 ...
Right: The 774-775 AD carbon-14 spike. [more] It’s not clear that all Miyake Events are caused by the sun. Supernova explosions and gamma-ray bursts also produce carbon-14 spikes. However, the evidence tilts toward solar storms. For each of the confirmed Miyake Events, researchers have found matching spikes of 10Be and 36Cl in ice cores. These isotopes are known to trace strong solar ...
The carbon-14 data (center) along with the associated spikes in the ice core data of beryllium-10 (top) and chlorine-36 (bottom) are all consistent with a proton-rich solar flare event for the ...
A new paper has shed light on spikes in radiocarbon trapped in tree rings called 'Miyake events', finding it's not as simple as it seems.
Miyake Events occur on the Sun and create "spikes" in the amount of carbon-14 in Earth's environment. The researchers in this study used the link between carbon-14 and tree rings to understand ...
Scientists uncovered this event in 2012 when analyzing a spike in carbon-14 found in tree rings. Trees around the world bear evidence of the carbon-14 spike, showing that the event was global in ...
According to information on Spaceweather.com, Nagoya University PhD student Fusa Miyake made an important discovery in 2012 while studying the stump rings of a 1,900-year-old Japanese cedar tree. Signs of extraordinary cosmic radiation in tree rings: Miyake events One ring, in particular, caught his eye. Grown in A.D. 774-75, it contained a 12 percent increase in carbon-14 (14C), a n isotope ...
Miyake events represent immense spikes in carbon-14 production, possibly but not necessarily from solar storms. The radioactive carbon gets incorporated into tree rings, which is how we know about it.
The 774–775 carbon-14 spike is an observed increase of 1.2% in the concentration of carbon-14 isotope in tree rings dated to 774 or 775, which is about 20 times as high as the normal background rate of variation.
The events are named after the Japanese physicist Fusa Miyake who, as a doctoral student, was the first one to identify these radiocarbon spikes and published the results with co-authors in 2012 in the journal Nature. [16] The investigation at that time found a strong 14 C increase in the annual rings of Japanese cedars for the years 774/775. The event of 775 was independently discovered ...
Something big happened in the year A.D. 774. Scientists studying tree rings found a sharp increase in the amount of radioactive carbon-14 recorded in the rings of ancient Japanese cedar trees ...