研究者業績
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  2. 坂尾 太郎

坂尾 太郎

サカオ タロウ  (Taro Sakao)

基本情報

所属
国立研究開発法人宇宙航空研究開発機構 宇宙科学研究所 准教授
学位
博士(理学)(東京大学)
ORCID ID
 https://orcid.org/0000-0003-2991-4159
J-GLOBAL ID
200901017841696830
researchmap会員ID
5000019450

X線観測を中心に、飛翔体を用いた太陽物理学の研究を行なっています。

「ひので」、「ようこう」、SDOなどの衛星に搭載されたX線望遠鏡やEUV望遠鏡をはじめとする、飛翔体観測機器のデータを用いて、太陽フレアで発生するプラズマ粒子の爆発的な加熱と加速や、それらの惑星間空間への影響など、コロナ中のプラズマ活動現象の理解をめざします。

また、「ようこう」の硬X線望遠鏡HXTや「ひので」のX線望遠鏡XRTなど、新しい観測を可能とする装置開発を手がけており、現在は、将来の太陽高エネルギープラズマの研究に向けた、高空間分解能・低散乱性能を持つX線斜入射ミラーや、光子計測型の高速X線ピクセル検出器などの開発研究、および将来の飛翔体ミッションの検討を進めています。

I have been engaged in solar physics research with space and sub-orbital observations chiefly in X-ray wavelengths.

By use of data from instruments such as X-ray or EUV telescopes aboard Hinode, Yohkoh, and SDO, I aim to understand plasma activities in the solar corona, including explosive heating and acceleration of coronal plasmas during flares and their interplanetary consequences.

Meanwhile, I have participated in the development of instruments which make possible new observations of the solar corona; e.g., Hard X-ray Telescope (HXT) aboard Yohkoh and X-Ray Telescope (XRT) aboard Hinode. Currently, I am working on research and development of grazing-incidence X-ray mirrors (Wolter mirrors) of high spatial resolution/low scattering performance as well as photon-counting-type high-speed X-ray pixel detectors, together with studies on future space solar X-ray missions.

研究キーワード

 9

研究分野

 3

委員歴

 15
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受賞

 6
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論文

 126
  • Ryohko Ishikawa, Javier Trujillo Bueno, David E. McKenzie, Donguk Song, Tanausú del Pino Alemán, Ernest Alsina Ballester, Luca Belluzzi, Hao Li, Frédéric Auchère, Christian Bethge, Bart De Pontieu, Ryouhei Kano, Ken Kobayashi, Adam R. Kobelski, Takenori J. Okamoto, Laurel A. Rachmeler, Taro Sakao, Jiří Štěpán, Genevieve D. Vigil, Amy Winebarger
    The Astrophysical Journal 990(2) 200-200 2025年9月9日  査読有り
    Abstract We determine magnetic fields from the photosphere to the upper chromosphere combining data from the Hinode satellite and the CLASP2.1 sounding rocket experiment. CLASP2.1 provided polarization profiles of the Mg ii h and k lines, as well as of the Mn i lines around 2800 Å, across various magnetic structures in an active region, containing a plage, a pore, and the edges of a sunspot penumbra. By applying the weak-field approximation to the circular polarization profiles of these spectral lines, we obtain a longitudinal magnetic field map at three different heights in the chromosphere (lower, middle, and upper). This is complemented by data from Hinode (photospheric magnetic field), the Interface Region Imaging Spectrograph, and the Solar Dynamics Observatory (high spatial resolution observations of the chromosphere and corona). We quantify the height expansion of the plage magnetic fields and find that the magnetic fields expand significantly in the middle chromosphere, shaping the moss observed above in the transition region and corona. We identified an area with polarity reversal at the upper chromosphere around the edge of the pore, suggesting the presence of a magnetic discontinuity in the upper chromosphere. Transient and recurrent jetlike events are observed in this region, likely driven by magnetic reconnection. Around the penumbral edge, we find large-scale magnetic fields corresponding to the superpenumbral fibrils seen in the upper chromosphere. In the superpenumbral fibrils, we find Zeeman-induced linear polarization signals, suggesting the presence of a significantly inclined magnetic field, as strong as 1000 G in the upper chromosphere.
  • Yuanyong DENG, Hui TIAN, Jie JIANG, Shuhong YANG, Hao LI, Robert CAMERON, Laurent GIZON, Louise HARRA, Robert F WIMMER-SCHWEINGRUBER, Frédéric AUCHÈRE, Xianyong BAI, RUBIO Luis BELLOT, Linjie CHEN, Pengfei CHEN, Lakshmi Pradeep CHITTA, Jackie DAVIES, Fabio FAVATA, Li FENG, Xueshang FENG, Weiqun GAN, Don HASSLER, Jiansen HE, Junfeng HOU, Zhenyong HOU, Chunlan JIN, Wenya LI, Jiaben LIN, Dibyendu NANDY, Vaibhav PANT, Marco ROMOLI, Taro SAKAO, Sayamanthula KRISHNA PRASAD, Fang SHEN, Yang SU, Shin TORIUMI, Durgesh TRIPATHI, Linghua WANG, Jingjing WANG, Lidong XIA, Ming XIONG, Yihua YAN, Liping YANG, Shangbin YANG, Mei ZHANG, Guiping ZHOU, Xiaoshuai ZHU, Jingxiu WANG, Chi WANG
    Chinese Journal of Space Science 45(4) 913-913 2025年  査読有り
  • Riko Shimizu, Noriyuki Narukage, Taro Sakao, Yoshiaki Sato, Sota Kashima, Tadayuki Takahashi, Shunsaku Nagasawa, Takahiro Minami, Toshiya Iwata, Lindsay Glesener, Rie Suzaki
    Proc. SPIE 13103 1310308 (16pp) 2024年8月27日  
    SPIE Astronomical Telescopes + Instrumentation, 2024 X-Ray, Optical, and Infrared Detectors for Astronomy XI
  • Yoshiaki Sato, Noriyuki Narukage, Hayato Inuzuka, Futoshi Yoshimura, Sota Kashima, Riko Shimizu, Juan Camilo Buitrago-Casas, Wayne H. Baumgartner, Nicholas E. Thomas, Taro Sakao, Lindsay Glesener
    Proc. SPIE 13093 130936X (9pp)-264 2024年8月21日  
    SPIE Astronomical Telescopes + Instrumentation, 2024 Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray
  • Taro Sakao, Sota Kashima, Satoshi Matsuyama, Takato Inoue, Haruhito Iriyama, Shinnosuke Kurimoto, Kazuto Yamauchi, Yoshiki Kohmura, Akira Miyake, Hiroki Nakamori, Shunichiro Matsuzaka, Toshiki Taniguchi, Toshio Nakano, Noriyuki Narukage
    Proc. SPIE 13093 1309353 (6pp) 2024年8月21日  筆頭著者
    SPIE Astronomical Telescopes + Instrumentation, 2024 Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray
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MISC

 65

書籍等出版物

 3

講演・口頭発表等

 211
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担当経験のある科目(授業)

 16
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所属学協会

 11
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Works(作品等)

 1

共同研究・競争的資金等の研究課題

 17
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学術貢献活動

 49
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社会貢献活動

 55

● 専任大学名

 1
  • 専任大学名
    総合研究大学院大学（SOKENDAI)

● 所属する所内委員会

 1
  • 所内委員会名
    放射線安全委員会
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