From the Sun to the Stars: Building of a Universal Theory of Spots and Flares Based on Numerical and Observational Studies
| Project/Area Number |
16K17671
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (B)
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Astronomy
|
|---|
| Research Institution | National Astronomical Observatory of Japan |
|---|
Principal Investigator |
Toriumi Shin 国立天文台, 太陽天体プラズマ研究部, 特任助教 (30738290)
|
|---|
| Project Period (FY) |
2016-04-01 – 2019-03-31
|
| Project Status |
Completed (Fiscal Year 2018)
|
| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
|
|---|
| Keywords | 太陽物理学 / プラズマ物理学 / 磁気流体力学 / 太陽黒点 / 太陽フレア / 活動領域 / 黒点 / 太陽 / 恒星 / フレア |
|---|
| Outline of Final Research Achievements |
It is known that the flares on the Sun and stars, which are the releasing of magnetic energy, tend to appear in active regions (ARs) including sunspots. With the aim to reveal the mechanisms behind these phenomena, we performed the following research activities. (1) Analyzing the observational data of strong solar flares for six years, we revealed the relationship between the flare durations and AR magnetic fields, and the magnetic structures of flare-productive ARs. (2) We numerically reproduced the magnetic structures of flaring ARs and elucidated the importance of twist and interaction of magnetic fields within the stellar interior. (3) With thermo-dynamical simulations, we unraveled the statistical relation between the flare durations and AR magnetic fields and discussed the possible application to the stellar flare data. (4) Related studies were also performed.
|
| Academic Significance and Societal Importance of the Research Achievements |
本研究課題によって、大型の太陽フレアを生じやすい黒点の磁場構造や、その形成過程が明らかになった。また、太陽フレアの継続時間と磁場構造との相関関係を明らかにしたことで、空間分解観測の不可能な恒星フレアについても、フレア継続時間を測定することで磁場構造を解明できる可能性が示された。恒星黒点・恒星フレアの研究者との議論を通じ、実際の観測データにこれらの理論を応用する道筋をつけることができた。また、これらの諸現象を観測的・理論的観点からまとめた総説論文を執筆し、成果を広くコミュニティに還元できた。
|
Report
(4 results)
Research Products
(75 results)
-
-
-
-
-
-
-
-
-
-
[Journal Article] Lifetimes and Emergence/Decay Rates of Star Spots on Solar-type Stars Estimated by Kepler Data in Comparison with Those of Sunspots2019
Author(s)
Namekata, Kosuke; Maehara, Hiroyuki; Notsu, Yuta; Toriumi, Shin; Hayakawa, Hisashi; Ikuta, Kai; Notsu, Shota; Honda, Satoshi; Nogami, Daisaku; Shibata, Kazunari
-
Journal Title
The Astrophysical Journal
Volume: 871
Issue: 2
Pages: 187-187
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
-
-
-
-
[Journal Article] Solar Ultraviolet Bursts2018
Author(s)
Young P.R.、Tian H.、Peter H.、Rutten R.J.、Nelson C.J.、Huang Z.、Schmieder B.、Vissers G.J.M.、Toriumi S.、Rouppe van der Voort L.H.M. 、Madjarska M.S.、Danilovic S.、Berlicki A.、Chitta L.P.、Cheung M.C.M.、Madsen C.、Reardon K.P.、Katsukawa Y.、Heinzel P.
-
Journal Title
Space Science Reviews
Volume: 214
Issue: 8
Pages: 120-120
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
-
-
-
-
-
-
-
-
-
[Journal Article] The Characteristics of Solar X-Class Flares and CMEs: A Paradigm for Stellar Superflares and Eruptions?2016
Author(s)
Harra, Louise K.; Schrijver, Carolus J.; Janvier, Miho; Toriumi, Shin; Hudson, Hugh; Matthews, Sarah; Woods, Magnus M.; Hara, Hirohisa; Guedel, Manuel; Kowalski, Adam; Osten, Rachel; Kusano, Kanya; Lueftinger, Theresa
-
Journal Title
Solar Physics
Volume: 291
Issue: 6
Pages: 1761-1782
DOI
Related Report
Peer Reviewed / Int'l Joint Research
-
[Presentation] Solar-C_EUVST: Science Objectives and Collaborations2019
Author(s)
S. Toriumi, T. Shimizu, S. Imada, T. Kawate, C. Quitero Noda, K. Ichimoto, H. Hara, T. Watanabe, Y. Suematsu, Y. Katsukawa, and Solar-C WG, C. Korendyke, H. Warren, T. Tarbell, S. Solanki, L. Teriaca, L. Harra, A. Fludra, F. Auchere, A. Vincenzo, A. Zhukov, et al.
Organizer
1st ASO-S International Workshop
Related Report
Int'l Joint Research / Invited
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
