大学共同利用実験調整グループ

Daiki ISHI

  (伊師 大貴)

Profile Information

Affiliation
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
Degree
博士(理学)

Researcher number
90982108
J-GLOBAL ID
202301005251755990
researchmap Member ID
R000051605

Research History

 2

Committee Memberships

 1

Major Papers

 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, Aug 21, 2024  
  • Daiki Ishi, Kumi Ishikawa, Yoshizumi Miyoshi, Naoki Terada, Yuichiro Ezoe
    Publications of the Astronomical Society of Japan, 75(1) 128-152, Dec 12, 2022  
    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, Aug 1, 2020  
  • 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), Jan 1, 2019  

Presentations

 28

Professional Memberships

 6

Research Projects

 1

Industrial Property Rights

 1

Academic Activities

 1

Media Coverage

 3