| Budget Amount *help |
¥23,920,000 (Direct Cost: ¥18,400,000、Indirect Cost: ¥5,520,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2017: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2016: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
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| Outline of Final Research Achievements |
Large-scale Solar Proton Events (SPEs), originate from solar flares and coronal mass ejections, can cause enormous damage such as a breakdown of artificial satellites. Although the large-scale SPEs have been observed directly for the past ~70 years, the longer-term characteristics of SPE (e.g., their occurrence rate and upper limit) are not well understood. The purpose of this study is to investigate the signatures of large-scale SPEs occurred in the past by measuring the 14C concentration of tree rings, which is a proxy for large-scale SPE, with a one-year resolution and capturing a rapid increases in 14C concentrations. We aim to clarify the occurrence rate of large-scale SPEs and the relationship between the occurrence of large-scale SPEs and solar activity.
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