4:45 PM - 5:00 PM
[ACC29-18] Research of annual cosmic ray events using 10Be in the Dome Fuji ice core II
Keywords:cosmogenic nuclides, cosmic ray event
It has been reported rapid 14C increases in tree-rings for the periods AD 775, AD 994, 660 BC, 3371 BC and 5480 BC. Although it has been proposed that an origin of these events relates to solar energetic particles, information of production ratio between different nuclides are needed to determine the origin. As for the AD 775 and the AD 994 cosmic ray events, increments of concentrations in 14C (tree-rings), 10Be and 36Cl (ice cores) were detected, and it has been reported that the origin of the events is not contradictory to extreme Solar Proton Event.
In this presentation, we will report the results of quasi-annual 10Be measurements of ice core from Dome Fuji around ca. 660 BC.