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- Title
High‐Resolution <sup>10</sup>Be and <sup>36</sup>Cl Data From the Antarctic Dome Fuji Ice Core (∼100 Years Around 5480 BCE): An Unusual Grand Solar Minimum Occurrence?
- Authors
Kanzawa, K.; Miyake, F.; Horiuchi, K.; Sasa, K.; Takano, K.; Matsumura, M.; Takahashi, T.; Motizuki, Y.; Takahashi, K.; Nakai, Y.; Ohtani, K.; Tada, Y.; Ochiai, Y.; Motoyama, H.; Matsuzaki, H.; Yamazaki, A.; Muramatsu, Y.; Yamagata, T.
- Abstract
Cosmogenic nuclides in tree rings and polar ice cores record the information of past cosmic ray intensities and solar activities. A large 14C increase over 10 years has been discovered around 5480 BCE. The 14C variations in this event differ from those of other short‐term cosmic ray events and typical grand solar minima. To elucidate the cause of the 14C increase around 5480 BCE, we measured the 10Be and 36Cl concentrations in the Antarctic Dome Fuji ice core at quasi‐annual and 4–5 years resolutions, respectively. Based on the combined 14C, 10Be, and 36Cl data, the 5480 BCE event was probably not caused by a solar proton event (SPE) or a gamma‐ray event, because the 36Cl concentration did not significantly increase as expected in these events. The incremented 10Be data were enhanced similarly to those of recent grand solar minima, but more rapidly increased (over ∼10 years). These results suggest that an unusual grand solar minimum occurred around 5480 BCE, characterized by a rapidly decreasing solar activity. Key Points: New high‐resolution 10Be and 36Cl data for the 5480 BCE cosmic ray event were taken from the Antarctic Dome Fuji ice coreMeasured 36Cl/10Be ratio was not suitable for either solar proton event or gamma‐ray event originsThe 5480 BCE event might refer to the unusual grand solar minimum which solar activity decreased rapidly in ∼10 years
- Subjects
COSMOGENIC nuclides; ANTARCTIC ice; COSMIC rays; ASTROPHYSICAL radiation; IONIZING radiation
- Publication
Journal of Geophysical Research. Space Physics, 2021, Vol 126, Issue 10, p1
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2021JA029378