Study in physical process of the solar photosphere-chromosphere coupling using 1.5 m aperture diffraction-limited observations

2022 Fiscal Year Final Research Report

• Project/Area Number: 19H01944
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 16010:Astronomy-related
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: Suematsu Yoshinori 国立天文台, 先端技術センター, 特命専門員 (50171111)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 太陽光球 / 太陽彩層 / 磁場観測 / 面分光 / 近赤外狭帯域フィルター

Outline of Final Research Achievements

The physical mechanism of heating and dynamics of the solar chromosphere remains unresolved. Magnetic energy generated under the chromosphere is nonlinearized during its passage through the chromosphere, causing dynamical phenomena such as turbulence, shock waves, and jets, which produce the high-temperature chromosphere and corona. The chromosphere is the place where a series of processes of magnetic energy transport and dissipation through dynamical phenomena can be directly observed, and approaching the site of such processes is the state-of-the-art in solar physics research. We will develop a high-precision integral field unit and a narrow-band tunable filtergraph to be operated with a 1.5-m solar telescope to achieve the necessary spatial resolution, and advance our understanding of the transport and heating mechanisms of magnetic energy by analyzing high-quality magnetic field data provided by high-spatial and high-temporal resolution observations.

Free Research Field

太陽物理学

Academic Significance and Societal Importance of the Research Achievements

本研究で開発した面分光装置の鍵となる16配列35μｍ幅スライサー鏡は、口径1.5ｍ、近赤外で回折限界を達成する仕様であったが、より大きい口径の望遠鏡では可視光で回折限界性能を発揮でき観測研究の発展が期待できる。また、本研究の近赤外狭帯域チューナブルフィルターは、屈折率の大きいエタロンで構成されているため、小さな口径で太陽観測に必要な広視野を達成できる。合わせて本研究で用いた観測波長、データ解析の手法は、米国で運用中、欧州で検討中の口径4m太陽望遠鏡の面分光装置、近赤外狭帯域チューナブルフィルターにも適用できるものであり、将来の先端技術観測研究に生かすことができる点で意義が大きいと考える。