Repetitive 14C measurements for understanding of occurrence distribution of extreme SPEs in the 7-10th centuries
| Project/Area Number |
16K13802
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
Miyake Fusa 名古屋大学, 宇宙地球環境研究所, 准教授 (90738569)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
箱崎 真隆 国立歴史民俗博物館, 大学共同利用機関等の部局等, 特任助教 (30634414)
増田 公明 名古屋大学, 宇宙地球環境研究所, 准教授 (40173744)
|
|---|
| Project Period (FY) |
2016-04-01 – 2019-03-31
|
| Project Status |
Completed (Fiscal Year 2018)
|
| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
|
|---|
| Keywords | 樹木年輪 / 放射性炭素 / Solar Proton Event / 宇宙線生成核種 / 高精度14Cデータ / 大規模SPE / 太陽フレア頻度 / 放射性炭素14 |
|---|
| Outline of Final Research Achievements |
Rapid 14C increase events have been discovered in 774-775 and 993-994 CE by continuous 14C concentration measurements of tree rings. The most plausible cause of these 14C increase events are an extreme Solar Proton Event (SPE). Such extreme SPEs cause the destruction of satellites and terrestrial communication networks, and can be a natural disaster in modern society comparable to huge eruptions and earthquakes. The purpose of this study is to detect more 14C increase events smaller than the 775 and 994 events by an ultra-high precision measurement of 14C concentrations in annual tree rings for the period 600-1000 CE, and clarify an occurrence rate of 14C events. Although we detected some smaller 14C events, further validation will be necessary to identify the extreme SPE origins.
|
| Academic Significance and Societal Importance of the Research Achievements |
観測史上最大のキャリントンフレア（1859年）が仮に現在発生したとすると、人工衛星の故障や通信網の破壊等によって現代社会に深刻な被害を与えると予想されている。775年イベントは観測史上最大フレアの10倍以上の規模と考えられているため、過去にこのようなイベントがどの程度発生していたか知ることは非常に重要である。775年と994年の14Cイベントの発見により、14C単年測定が大規模SPE探索に有効であることが初めて示されたが、本研究ではさらに多くの、より小規模な14Cイベントを検出することで、大規模SPEの発生頻度の詳細について議論した。
|
Report
(4 results)
Research Products
(30 results)
-
-
-
-
[Journal Article] Verification of the Annual Dating of the 10th Century Baitoushan Volcano Eruption Based on an AD 774-775 Radiocarbon Spike2018
Author(s)
Hakozaki, M., Miyake, F., Nakamura, T., Kimura, K., Masuda, K., & Okuno, M
-
Journal Title
Radiocarbon
Volume: 60
Issue: 1
Pages: 261-268
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
-
[Journal Article] Atmospheric impacts of the strongest known solar particle storm of 775 AD2017
Author(s)
T. Sukhodolov, I. Usoskin, E. Rozanov, E. Asvestari, W.T. Ball1, M.A.J. Curran, H. Fischer, G. Kovaltsov, F. Miyake, T Peter, C. Plummer, W. Schmutz, M Severi & R. Traversi
-
Journal Title
Sci. Rep.
Volume: 7
Issue: 1
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
-
-
[Journal Article] Search for annual 14C excursion in the past2016
Author(s)
F. Miyake, K. Masuda, T. Nakamura, K. Kimura, M. Hakozaki, A.J.T. Jull, T.E. Lange, R. Cruz, I.P. Panyushkina, C. Baisan & M.W. Salzer
-
Journal Title
Radiocarbon
Volume: 印刷中
Issue: 2
Pages: 315-320
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
