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After that this event has been confirmed by several verifications using some other tree samples from all over the world. Also quasi decadal Be concentration data in the Antarctic ice core show rapid increase around AD 775. However, annual Be variations have not been revealed. We measured Be concentrations in the Antarctic Dome Fuji ice core with quasi-annual resolution for the period approximately from AD 763 to AD 794, and found a clear Be increase around AD 775 against a background variations. Since our quasi-annual Be data and Na ion data which obtained from the same ice core show similar variations, the background variation in Be concentration is considered as a climatic noise. It is possible that the large Be increase is

The AD 775 cosmic ray event shown in Beryllium-10 data from Antarctic Dome Fuji ice core