Associate for Education and Public Outreach

伊師 大貴

イシ ダイキ  (Daiki ISHI)

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 宇宙航空プロジェクト研究員
学位
博士(理学)

研究者番号
90982108
J-GLOBAL ID
202301005251755990
researchmap会員ID
R000051605

委員歴

 1

主要な論文

 26
  • Daiki Ishi, Yuichiro Ezoe, Ralf Boden, Yoshizumi Miyoshi, Kumi Ishikawa, Hiroshi Nakajima, Ikuyuki Mitsuishi, Masaki Numazawa, Yuki K. Satoh
    Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray 282-282 2024年8月21日  
  • Daiki Ishi, Kumi Ishikawa, Yoshizumi Miyoshi, Naoki Terada, Yuichiro Ezoe
    Publications of the Astronomical Society of Japan 75(1) 128-152 2022年12月12日  
    Abstract A model of geocoronal solar wind charge exchange (SWCX) emission was built and compared to five Suzaku detections of bright geocoronal SWCX events. An exospheric neutral hydrogen distribution model, charge exchange cross-sections, solar wind ion data taken with the ACE and WIND satellites, and magnetic field models of the Earth’s magnetosphere are all combined in order to predict time-variable geocoronal SWCX emission depending on line-of-sight directions of the Suzaku satellite. The modeled average intensities of O vii emission lines were consistent with the observed ones within a factor of three in four out of the five cases except for an event in which a line-of-sight direction was toward the night side of the high-latitude magnetosheath and a major geomagnetic storm was observed. Those of O viii emission lines were underestimated by a factor of three or more in all five cases. On the other hand, the modeled O vii and O viii light curves reproduced the observed ones after being scaled by ratios between the observed and modeled average intensities. In particular, short-term variations due to line-of-sight directions traversing cusp regions during an orbital motion of the Suzaku satellite were reproduced. These results are discussed in the context of model uncertainties.
  • Daiki Ishi, Yuichiro Ezoe, Kumi Ishikawa, Masaki Numazawa, Aoto Fukushima, Ryota Otsubo, Hikaru Suzuki, Tatsuya Yuasa, Sae Sakuda, Tomoki Uchino, Maiko Fujitani, Kazuhisa Mitsuda, Mark J. Sowa
    Applied Physics Express 13(8) 087001-087001 2020年8月1日  
  • Daiki Ishi, Kumi Ishikawa, Masaki Numazawa, Yoshizumi Miyoshi, Naoki Terada, Kazuhisa Mitsuda, Takaya Ohashi, Yuichiro Ezoe
    Publications of the Astronomical Society of Japan 71(1) 2019年1月1日  

講演・口頭発表等

 28

所属学協会

 6

共同研究・競争的資金等の研究課題

 1

産業財産権

 1

学術貢献活動

 1

メディア報道

 3