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
研究分野
2経歴
2-
2023年4月 - 現在
-
2019年4月 - 2022年9月
学歴
3-
2019年4月 - 2023年3月
-
2017年4月 - 2019年3月
-
2013年4月 - 2017年3月
委員歴
1-
2019年9月 - 2021年6月
受賞
3論文
26-
Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray 53-53 2024年8月22日
-
Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray 55-55 2024年8月22日
-
Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray 232-232 2024年8月21日
-
Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray 52-52 2024年8月21日
-
Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray 197-197 2024年8月21日
-
Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray 218-218 2024年8月21日
-
Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray 284-284 2024年8月21日
-
Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray 282-282 2024年8月21日
-
Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray 89-89 2024年8月21日
-
Journal of Astronomical Telescopes, Instruments, and Systems 9(03) 2023年9月12日
-
EUV and X-ray Optics: Synergy between Laboratory and Space VIII 2023年6月8日
-
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.
-
Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray 2022年8月31日
-
Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray 2022年8月31日
-
Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray 2022年8月31日
-
Optics Express 30(14) 25195-25195 2022年6月27日We have been developing a light-weight X-ray telescope using micro electro mechanical systems technologies for future space missions. Micropores of 20 µm width are formed in a 4-inch Si wafer with deep reactive ion etching, and their sidewalls are used as X-ray reflection mirrors. The flatness of the sidewall is an important factor to determine the imaging performance, angular resolution. It is known that hydrogen annealing is effective to smooth a Si surface. We tested 150 hour annealing to achieve the ultimately smooth sidewalls. After 50 hour, 100 hour, and 150 hour annealing, the angular resolution improved 10.3, 4.0, and 2.6 arcmin in full width at half maximum (FWHM) and 17.0, 14.5, and 10.8 arcmin in half-power width (HPW). In spite of this improvement, the edge shapes of the sidewall were rounded. Therefore, both edges of the sidewall were ground and polished, and then the angular resolution was improved further to 3.2 arcmin (FWHM) and 5.4 arcmin (HPW).
-
Publications of the Astronomical Society of Japan 73(3) 504-518 2021年3月16日Abstract X-ray emission generated through solar-wind charge exchange (SWCX) is known to contaminate X-ray observation data, the amount of which is often significant or even dominant, particularly in the soft X-ray band, when the main target consists of comparatively weak diffuse sources, depending on the space weather during the observation. In particular, SWCX events caused by interplanetary coronal mass ejections (ICMEs) tend to be spectrally rich and to provide critical information about the metal abundance in the ICME plasma. We analyzed the SN1006 background data observed with Suzaku on 2005 September 11 shortly after an X6-class solar flare, signatures of which were separately detected together with an associated ICME. We found that the data include emission lines from a variety of highly ionized ions generated through SWCX. The relative abundances of the detected ions were found to be consistent with those in past ICME-driven SWCX events. Thus, we conclude that this event was ICME driven. In addition, we detected a sulfur xvi line for the first time as one from an SWCX emission, which suggests that it is the most spectrally rich SWCX event ever observed. We suggest that observations of ICME-driven SWCX events can provide a unique probe to study the population of highly ionized ions in the plasma, which is difficult to measure in currently available in situ observations.
-
Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray 2020年12月13日
-
Applied Physics Express 13(8) 087001-087001 2020年8月1日
-
Journal of Astronomical Telescopes, Instruments, and Systems 6(02) 1-1 2020年6月30日
-
Applied Optics 58(19) 5240-5240 2019年6月28日
-
TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 17(4) 477-482 2019年
-
Publications of the Astronomical Society of Japan 71(1) 2019年1月1日
-
Japanese Journal of Applied Physics 57(6S1) 06HJ11-06HJ11 2018年5月18日
-
Applied Optics 57(12) 3237-3237 2018年4月19日
-
Japanese Journal of Applied Physics 56(6S1) 06GN04-06GN04 2017年5月10日
講演・口頭発表等
31-
Charge exchange X-ray Universe 2024
-
Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray
所属学協会
6-
2023年7月 - 現在
-
2020年12月 - 現在
-
2019年5月 - 現在
-
2017年7月 - 現在
-
2017年6月 - 現在
共同研究・競争的資金等の研究課題
1-
日本学術振興会 科学研究費助成事業 特別研究員奨励費 2019年4月 - 2022年3月
産業財産権
1学術貢献活動
1-
査読Publications of the Astronomical Society of Japan
メディア報道
3-
宇宙科学研究所 研究情報ポータル「あいさすGATE」 あいさすpeople 2024年1月22日 インターネットメディア
-
American Association for the Advancement of Science EurekAlert! 2023年1月28日 インターネットメディア
-
American Association for the Advancement of Science EurekAlert! 2022年7月16日 インターネットメディア