On the radiocarbon increase around 5480 BC as a result of the Solar system encounter with interstellar cloud

Isotopic Imprints of Heliosphere Collapse Caused by Interaction of the Solar System With Dense Interstellar Clouds

“…В [1] нами была выдвинута гипотеза о влиянии неоднородностей межзвездной среды на модуляцию ГКЛ. Там же рассмотрен один из возмож-ных таких случаев в районе 5480 г. до н.э.…”

Modelling cosmic radiation events in the tree-ring radiocarbon record

“…An alternative proposal considers a magnetar burst from a nearby magnetized neutron star [38], which is energetically plausible-but no sufficiently nearby or active neutron star is yet known from conventional astronomical observations. Pavlov et al [39] and Pavlov et al [40] have suggested prolonged events like 660 BCE and 5480 BCE are the result of enhanced Galactic cosmic ray flux over several years after the heliosphere is compressed by dense clouds in the interstellar medium. Closer to home, Liu et al [41] suggest the 14 C could be deposited into the atmosphere directly by a passing comet; this interpretation is rejected by Usoskin & Kovaltsov [42], who argue that such a comet would need to have been of a size ( 100 km) that would have devastated the Earth.…”

“…Pavlov et al. [39] and Pavlov et al. [40] have suggested prolonged events like 660 BCE and 5480 BCE are the result of enhanced Galactic cosmic ray flux over several years after the heliosphere is compressed by dense clouds in the interstellar medium.…”

High‐Resolution 10Be and 36Cl Data From the Antarctic Dome Fuji Ice Core (∼100 Years Around 5480 BCE): An Unusual Grand Solar Minimum Occurrence?

“…The cause of this unusual event remains unknown, but two likely hypotheses have been proposed: (a) a rapid change of GCRs, signifying either a special state of the grand solar minimum (Miyake et al., 2017) or a collision of the solar system with a compact interstellar cloud (Pavlov et al., 2019), and (b) an occurrence of multiple extreme SPEs (Miyake et al., 2017). The occurrence of extreme SPEs can be clarified by the 36 Cl/ 10 Be production ratio as explained above.…”