The Origin of Sunspot: Exploration by Local and Global MHD Numerical Models
| Project/Area Number |
15K17611
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | Aichi University of Education |
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Principal Investigator |
MASADA YOUHEI 愛知教育大学, 教育学部, 講師 (30590608)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 太陽 / ダイナモ / 電磁流体力学 / 天文学 / 流体力学 / 電磁流体 / 黒点 / 磁場 / 磁気流体力学 / プラズマ / 宇宙天気 / 宇宙気候 |
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| Outline of Final Research Achievements |
A longstanding goal of solar interior physics is to self-consistently reproduce sunspots from magnetic fluxes generated in the solar interior. However, there is still a large gap between the dynamo theory in the interior and the active region formation theory at the surface. For bridging the gap between them, we conducted in this study a convective dynamo simulation in a strongly stratified atmosphere resembling the solar interior in Cartesian geometry. In addition to the large-scale dynamo which has physical properties similar to those in earlier weakly-stratified convective dynamo simulations (Masada & Sano 2014a,b), we found that large-scale structures of the vertical magnetic field are spontaneously organized in the convection zone surface only in cases with a strongly-stratified atmosphere (Masada & Sano 2016, ApJL). Additionally, we found the critical Rossby-number for successful large-scale dynamo is around Ro = 0.03 (Masada & Sano 2018 in prep.).
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Report
(4 results)
Research Products
(29 results)
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[Presentation] 太陽内部進化と磁気活動2016
Author(s)
政田洋平
Organizer
地球型惑星圏環境に関する研究集会
Place of Presentation
立教大学（東京都豊島区）
Year and Date
2016-12-26
Related Report
Invited
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