研究チームは、日本の古代樹木の炭素14濃度の急上昇を分析し、中世の赤いオーロラの記録と照合することで、1200年頃に地球を襲った強力な太陽陽子イベントの証拠を発見しました。
沖縄科学技術大学院大学の研究チームが主導したこの研究では、この亜極端な現象が1200年の冬から1201年の春の間に発生したことが特定されました。研究では、青森県で出土したアスナロの樹木を用いた超高精度の炭素14測定結果と、日本の日記に記された北の空の赤い光の記述や中国での類似の報告などの歴史的記録が統合されました。
Researchers have found that faint red auroras visible from Japan can extend far higher into the atmosphere than previously thought, even during moderate solar storms.
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Scientists have detected traces of iron-60 in Antarctic ice up to 80,000 years old, showing that the solar system is moving through material from an ancient stellar explosion. The findings come from a study published in Physical Review Letters and point to the Local Interstellar Cloud as the source of the radioactive isotope.
Researchers are debating whether droughts triggered unrest in late Roman Britain during the so-called Barbarian Conspiracy of 367 AD. A study using tree ring data linked severe summer droughts in 364-366 to poor harvests and rebellion, but historians say the historical sources have been misinterpreted. The dispute underscores challenges in combining climate data with historical records.
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Wildfires raging across Arctic and boreal regions are igniting ancient carbon in soils, releasing far more carbon dioxide than climate models have assumed. A new study of soil cores shows that some fires are burning organic matter up to 5,000 years old.
Researchers in South Korea have found stromatolites inside the Hapcheon impact crater, suggesting asteroid strikes created conditions that supported early oxygen-producing life.
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Astronomers have traced a high-energy neutrino to a distant galaxy powered by intense star formation rather than a supermassive black hole. The finding challenges previous assumptions about the origins of cosmic neutrinos.