Cosmic ray event of A.D. 774-775 shown in quasi-annual10Be data from the Antarctic Dome Fuji ice core

• DOI: 10.1002/2014gl062218
• Publication Date: 2014-12-11T15:23:02Z
• Authors: Fusa Miyake; Asami Suzuki; Kimiaki Masuda; Kazuho Horiuchi; Hideaki Motoyama; Hiroyuki Matsuzaki; Yuko Motizuki; Kazuya Takahashi; Yoichi Nakai
• Keywords: Ice core; Dome (geology)

14C content in tree rings and 10Be concentration records polar ice core provide information about past cosmic ray intensities. The A.D. 774–775 event has been identified by measurement several from all over the world. Although quasi-decadal Dome Fuji data Antarctic also shows a sharp peak around 775, annual variations or other cores have not revealed. We measured quasi-annual concentrations approximately 763–794 core, detected clear increase (~80% above baseline) 775. However, an accurate height of this is straightforwardly estimated due to background variation concentration. can be same as shown 774–775.