Cosmic ray event of A.D. 774–775 shown in quasi‐annual 10Be data from the Antarctic Dome Fuji ice core. Issue 1 (8th January 2015)

• Record Type: Journal Article
• Authors: Miyake, Fusa; Suzuki, Asami; Masuda, Kimiaki; Horiuchi, Kazuho; Motoyama, Hideaki; Matsuzaki, Hiroyuki; Motizuki, Yuko; Takahashi, Kazuya; Nakai, Yoichi
• Is Part Of: Geophysical research letters. Volume 42:Issue 1(2015:Jan.)
• Page Start: 84
• Page End: 89
• Publication Date: 2015-01-08
• Subjects: Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2014GL062218
• Languages: English
• ISSNs: 0094-8276

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <p> ¹⁴C content in tree rings and ¹⁰Be 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 ¹⁴C measurement in several tree rings from all over the world. Although the quasi‐decadal ¹⁰Be Dome Fuji data in the Antarctic ice core also shows a sharp peak around A.D. 775, annual ¹⁰Be variations in the Dome Fuji core or in other cores have not been revealed. We have measured quasi‐annual ¹⁰Be concentrations from approximately A.D. 763–794 in the Dome Fuji ice core, and detected a clear increase (~80% above the baseline) in ¹⁰Be concentration around A.D. 775. However, an accurate height of this increase is not straightforwardly estimated due to the background variation in ¹⁰Be concentration. The ¹⁰Be increase can be due to the same cosmic ray event as shown in the ¹⁴C content in A.D. 774–775.</p> </abstract>