| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
It is considered that 14C contents in tree rings and 10Be concentrations in ice cores would record the past incoming cosmic ray intensities. The purposes of this study are to specify the origin of the annual cosmic ray increase event in AD 775, and to search for other cosmic ray events.
We showed that the plausible origin of the 775 event is an extreme SPE (or several SPEs) by measuring 10Be concentrations in the Dome Fuji ice core in the Antarctica. Also we showed an extreme annual event comparable to the 775 event is very rare, and found a different type of cosmic ray increase event by 14C measurements for the BC time period.
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