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2023 Fiscal Year Final Research Report

Observational study on solar coronal heating using chromospheric magnetic field measurement and deep learning

Research Project

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Project/Area Number 20K04019
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 16010:Astronomy-related
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

Okamoto Joten  国立天文台, SOLAR-Cプロジェクト, 助教 (70509679)

Project Period (FY) 2020-04-01 – 2024-03-31
Keywordsロケット観測 / 太陽 / 彩層 / 磁場 / ゼーマン効果 / 紫外線 / 偏光分光
Outline of Final Research Achievements

Through the sounding rocket experiments CLASP2 and CLASP2.1 and the analysis of the obtained data, we succeeded in deriving the magnetic field strength at three different altitudes in the solar chromosphere and clarified the three-dimensional structure of the solar chromospheric magnetic field from observations for the first time in the world. After careful analysis and discussion of the usefulness of the time variation of the derived magnetic field, we concluded that the CLASP2 optical system is incapable of detecting changes in the magnetic field strength based on events such as wave motions.

Free Research Field

太陽物理学

Academic Significance and Societal Importance of the Research Achievements

太陽大気の中でも彩層は非常に活動的な層であり、その磁気的振る舞いが太陽大気における様々な現象の源となっている。よって、彩層の磁場構造を明らかにすることは、地球へも少なからず影響を及ぼすフレアの発生や太陽風の性質を理解することにつながる。今回の成果は、太陽表面からコロナへとつながる未知の磁場構造を解き明かした点、また、我々が開発した観測技術が彩層磁場構造の研究に有効であることを実証した点で画期的である。

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Published: 2025-01-30  

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