Research on solar active regions and flare occurrence through a numerical and observational approach

2015 Fiscal Year Final Research Report

• Project/Area Number: 26887046
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• 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): 2014-08-29 – 2016-03-31
• Keywords: 太陽物理学 / 活動領域 / 黒点 / フレア / 磁気流体力学

Outline of Final Research Achievements

By combining magnetohydrodynamic simulation and satellite observation data analysis, we conducted a research on the formation mechanism of sunspots and active regions and the occurrence of solar flares. As a result, we revealed for the first time that the vigorous explosions and jet ejections seen in the developing phase of the sunspots are caused by magnetic reconnection, which is driven by magneto-convective evolution. Also, we carried out statistical data analysis on the active regions that produced large-scale solar flares and found that, for example, the flare duration is correlated with the length of magnetic fields, larger active regions have less coronal mass ejections, etc.

Free Research Field

太陽天体プラズマ物理学