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Cosmic ray event of A.D. 774–775 shown in quasi‐annual 10 Be data from the Antarctic Dome Fuji ice core
Author(s) -
Miyake Fusa,
Suzuki Asami,
Masuda Kimiaki,
Horiuchi Kazuho,
Motoyama Hideaki,
Matsuzaki Hiroyuki,
Motizuki Yuko,
Takahashi Kazuya,
Nakai Yoichi
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl062218
Subject(s) - ice core , dome (geology) , cosmic ray , core (optical fiber) , geology , event (particle physics) , atmospheric sciences , astrophysics , physics , climatology , paleontology , optics
14 C content in tree rings and 10 Be concentration records in polar ice core provide information about past cosmic ray intensities. The A.D. 774–775 cosmic ray event has been identified by 14 C measurement in several tree rings from all over the world. Although the quasi‐decadal 10 Be Dome Fuji data in the Antarctic ice core also shows a sharp peak around A.D. 775, annual 10 Be variations in the Dome Fuji core or in other cores have not been revealed. We have measured quasi‐annual 10 Be concentrations from approximately A.D. 763–794 in the Dome Fuji ice core, and detected a clear increase (~80% above the baseline) in 10 Be concentration around A.D. 775. However, an accurate height of this increase is not straightforwardly estimated due to the background variation in 10 Be concentration. The 10 Be increase can be due to the same cosmic ray event as shown in the 14 C content in A.D. 774–775.