The study of solar flare triggering mechanism and its prediction

2015 Fiscal Year Final Research Report

• Project/Area Number: 23340045
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Astronomy
• Research Institution: Nagoya University
• Principal Investigator: Kusano Kanya 名古屋大学, 宇宙地球環境研究所, 教授 (70183796)
• Co-Investigator(Kenkyū-buntansha): ASAI Ayumi 京都大学, 大学院理学研究科, 准教授 (50390620) ; IMADA Shinsuke 名古屋大学, 宇宙地球環境研究所, 助教 (40547965) ; SHIOTA Daiko 名古屋大学, 宇宙地球環境研究所, 助教 (90462192)
• Co-Investigator(Renkei-kenkyūsha): MIYOSHI Takahiro 広島大学, 大学院理学研究科, 助教 (60335700) ; MINOSHIMA Takashi 国立研究開発法人海洋研究開発機構, 数理科学先端技術分野, 研究員 (00514811)
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: 太陽フレア / コロナ質量放出 / 宇宙天気 / 太陽 / コロナ / 予測 / 予報

Outline of Final Research Achievements

We studied the triggering mechanism of solar flares by systematically surveying the nonlinear dynamics caused by a wide variety of magnetic structures in terms of three-dimensional magnetohydrodynamic simulations and the analyses of data observed by solar physics satellites Hinode and SDO. As a result, we determined that two different types of small magnetic structures favor the onset of solar eruptions. These structures, which should appear near the magnetic polarity inversion line (PIL), include magnetic fluxes reversed to the potential component or the nonpotential component of major field on the PIL.
These results suggest that forecasting of solar eruptions is possible with sophisticated observation of a solar magnetic field, although the lead time must be limited by the timescale of changes in the small magnetic structures.

Free Research Field

太陽物理学